When can mnk player enjoy this game

They took 3 years to nerf Aim-assist by a tiny margin, but controller still remains statistically far superior.
If i recall properly, controller players still have higher average accuracy then MnK in modded servers with .15AA (half of current) 
Not fair in the slightest. 

They've failed 6 years to detect Controller cheats(Chronos/Zen), only recently acknowledged the issue with minor actions. But now similar Rotational AA and anti recoil capabilities are accessible for all controller players via RC filters. No official statement of plans to address this discrepancy. 
I think the current bronze rank balance team actually believes the game is fair and balanced.

Suggestion, make AA or .15 in diamond and above lobbies and pro-league. 
The over-tuned AA is ok for allowing noobs to enjoy the game casually, but is not even remotely balanced or fair for any competitively minded player. Better late than never. 

"When can mnk player enjoy this game?"

When Respawn finally separates MnK players from their controllers. When? Ask them. It's been taking them a long time.

To be fair, a fair few of the Controller companies have removed things like RC Filters (I think Gamesir did it the second that ALGS announced they were banning it's use) so for the most part that's not a problem (and even if people try to work around it by downloading older software it still doesn't work) so that's not as big a deal as people make it out to be. As for Aim Assist in general, it's only really powerful close range, but even then movement techniques can counter it against all but the absolute best players. I've played MnK and Controller, and whilst I prefer Controller out of familiarity (I only switched to PC gaming 2 years ago after 30 years of Console gaming) I much prefer the movement on MnK and i've found that even something as simple as Tap Strafe will **bleep** up most Controller players as they can't track your movement - I play on a higher sensitivity than normal (5-4 rather than the typical 4-3) and i'll come across someone with good movement just Tap Strafing around me and i'm lucky if I land 2 or 3 shots from 2 full magazines of an R99 from close range because I cant track them fast enough - that's how you overcome a Controller player close range, pure movement, getting off a few bursts in the process while they mag dump and barely touch you. If an MnK player just stands in front of a Controller player close range and just tries peeking a wall then they get whooped, 100% ... but I always say this to every MnK player as someone who plays both, if you're going to complain about Controller players - go buy one and play it yourself so that you understand it! Once you understand it's benefits and drawbacks, you can learn how to overcome it. MnK you get an enormous advantage with your ability to fine-aim at Medium to Long range, something you can't really do with a Controller, and you can control Recoil at those distances significantly better too. Plus like I said before, you get an enormous Movement advantage playing MnK and way less Input Lag compared to a Controller (Typically 1ms-2ms with MnK vs anything from 3ms-16ms with a Controller), not to mention the Polling Rates, with MnK easily being 1000Hz+ and Controllers varying depending on which one you use (and even if you buy an 8k controller, that actually disables AA in Apex for some reason)... With a Controller your advantage is entirely Close Range, you don't have the movement of MnK (unless you have a modified controller and can map inputs that can help to get around some of the movement debuffs)

Both inputs obviously have different strengths and weaknesses, and I’m not saying controller has no downsides.
The issue is that the strength balance is just not even close.

Using this years ALGS weapons meta data, roughly 70% of kills from the listed weapons are coming from close-range weapons. Close range is exactly where rotational aim assist is strongest. So saying “MnK has better long range and movement” doesn’t really solve the problem when most impactful fights are close range.

Also, the pro scene shifting more and more toward controller.  This year’s Apex Pro League is now around 75% controller players(90+% for fragger roles). Three years ago it was around 40% controller, and in year 1 ALGS it was 85% MnK. A lot of skilled MnK players either quit completely or switched inputs because MnK became useless in the fights. (PC Predators are also 85%+ controller, worse, majority are undetected zim or chronous)

I’m fine with powerful aim assist existing for casual play. It makes sense there. But in Diamond+ and especially pro play, it should be tuned down harder. Maybe around .15 or at least 150ms activation delay so cross-input firefights doesn't feel like a death-sentence for Mnk.

cause you are just a controller fps noob,in D3+,controller players are dominating