Bad-looking textures, editing "config.cfg" won't work

There is some steps from tf2 forum official site:

Uninstall any graphics overlay related software (GeForce experience, Fraps, etc etc.).

Open Nvidia Control Panel -> Manage 3D Settings -> Restore. Make sure all settings are at the default, ie: Application Controlled. If that doesn't help, try setting Maximum pre-rendered frames to 1. If that still doesn't help, try 3. Can also try single screen and max performance settings.

Disable any graphical overlay/recording/utility software like Origin overlay (Origin -> Application Settings -> More -> Origin In-Game -> Enable Origin In-Game -> Off), GeForce experience recorder/overlay, Fraps, etc. Make sure to kill all processes related to these auxiliary tools in Task Manager (Nvidia Share, Nvidia Capture Server, etc.), then start Titanfall2.

Settings -> Video -> Restore Recommended Settings (use the in-game menu, not the GeForce Experience or similar tools).
Try turning triple buffered vsync.
Try turning the Adaptive Resolution FPS Target to 0, which turns off adaptive res.

So, I dont have any other steps for u now except test in with some other discrete video card (i.e. take it from some friend)...

After following all of these steps (and, of course, obtaining absolutely no positive result), I think I'll just point out any possible reason I know for textures not to be used properly (so that maybe someone would come up with something new to try), re-install the game and eventually give up on graphics quality even though I quite literally cannot use my favorite weapon as a consequence.

• At the beginning, I thought it was the adaptive resolution: when I turned it on, the texture quality immediately went down to Low, because apparently the game thinks other graphic enhancements are more important than textures. Doesn't the texture resolution only unnoticeably affect the game's performance? Why am I able to run other games (Titanfall, Titanfall 2 before the update, Warframe, Mass Effect 1/2/3, even Crysis 2/3 on the second-highest setting),  with maximum texture quality?
• After roaming on the internet for not too much, I noticed that a massive amount of people reported the same problem. Deleting the whole documents folder never worked, but adding that famous line on the config.cfg file ALWAYS worked for them. Not for me. Again, if my GC doesn't have enough VRam, how can I run games smoothly, happily, perfectly with very high texture quality? Maybe I can't run "insane" textures, but I want at least the medium setting to work. With low settings, you can see pixels without even trying.
• After that attempt at fixing this problem, I came here (where I found out that I had at first modified the wrong file, but the outcome hadn't changed). I was told to repair the game and update my drivers (classic "fix").    nope.avi
• I turned that Xbox thing off (of which I neither remember the name or have any desire to have on my PC).
• I disabled the multi-display support (what does it even do? Can a game run on two windows/monitors, and would there be any point to it?) from the NVidia control panel, soft-reset my PC and physically detached the monitor for safety. I hardly see how a theoretical issue regarding monitors would make the game SPECIFICALLY FORCE ME TO HAVE ANTI-ALIASED SQUARES PROJECTED ALL OVER MY RETINA (necessary rant).
• Added the following lines to the videosettings.txt file: "setting.stream_memory" "768000"; "setting.mat_picmip" "0". I guess I kinda know what that does more or less but idk lol. Didn't work.
• As suggested, I mettled around with aspect ratio, display mode and resolution settings, but I didn't think it would have anything to do with textures. Alas, that was true.
• Dug my head in my bed's pillow and screamed. (another pointless written manifestation of my frustration)
• Made sure I had no running 3rd-party overlay programs (I have OBS, but I wasn't running it), disabled Origin's overlay, "defaultize" the NVidia Control Panel settings for TF2, and skipped the steps @MADrag0n suggested next (since they were already satisfied). My friends are not really willing to lend me their GC (it's a supposition, but hey, I don't think anyone at all would lend me their GC unless it's a spare one, ever).

Thank you for trying to help me, but I'll redownload the whole game. It's better than waiting forever for a fix.

If it works, I'm going to update this thread, but it'll take at least 2 days.

@InvitativnI

"Doesn't the texture resolution only unnoticeably affect the game's performance?"
Sizes of textures - this is one of the first parameters that strongly influence performance. For big textures not only is the large size of the video memory is filled immediately, as even most of the other operations with textures immediately begin to use more resources of CPU and GPU...

"Again, if my GC doesn't have enough VRam, how can I run games smoothly, happily, perfectly with very high texture quality?"
One game strife to another...
For TF2 "insane" textures, GC should have more= 8Gb VRAM!

"I don't think anyone at all would lend me their GC unless it's a spare one, ever"
They do not necessarily lend it to u, but just bring it and install it and test game i.g. one hour and if game run good on GC with 2Gb or more in ur case it would clearly show a problem...

All is simple: if GC don't meet min requirements (2Gb of VRAM) or CPU, then u don't have a guarantee to running game normal and any problems may acquire... I.g. another requirement is 4-core CPU... Seemingly a game must somehow run on any 2-cores CPUs, but developers decided to play normally on such a CPU in any case will not be possible and a game don't run on almost all 2-cores CPU (u have to use dll injector for running it nevertheless on own risk)...

A friend of mine plays Titanfall 2 with a laptop, he has to keep every setting at its lowest-quality value to achieve 30 mere frames per seconds. Still, I asked him to temporarily change the texture quality to Medium and it ran normally (then he realized he could keep them). I'd like to remark that texture quality is my one and only problem, since I have a 4-core CPU (2.80GHz clock), around 4 gibibytes of Display Memory (of which nearly 1 gibibyte is dedicated) and 8GiB of main memory. This is the only game that has ever given me this kind of problem; I would guess Titanfall 2 wants to run on 8-cores CPUs, but I just barely slightly doubt that's the case.

there will still be a lot of TF2 patches and resolved, and new problems)))