Please improve infantry weapon's Accuracy

I haven't played the Battlefield 6 beta enough to know the exact details of the recoil/spread system, so perhaps I'll change my opinion after release. That said, I didn't have significant issues compensating for recoil and spread. If recoil were actually (completely) random, you couldn't compensate for it, and you'd actually reduce the overall accuracy of burst/full-auto firing. That would seem contrary to what you're asking for.

Most weapons seemed to have a mostly diagonal recoil pattern, that you certainly could compensate for. Spread has always been a matter of judging what kind of burst cadence you need to maintain at a given distance. The spread value of a gun exists so you can't just tapfire your SMG and accurately hit a target at 400 meters away. Then there's also the spread increase per shot, that prevents you from magdumping players at insane ranges, as long as you can control the recoil.

Which things never should be so complicated like this. 

Things are actually quite simple. Pull your mouse in the opposite direction of the recoil. Stop firing your gun for a short moment if you notice the spread becomes too severe.

If you don't want to do any of that, there's a solution. Just use the KTS100 LMG, that thing has pretty much no recoil and can beam players across the map.