I play grand strategy games 12 hours a day when there's nothing else to do and my brain continues to rot. Screen time = brain fog.
It's a catch 22 though because on one hand cutting out screen time makes you function better, but on the other hand you're a subhuman incel autist who stands to gain absolutely nothing from functioning better in society (except for more money so you can pay mr noseberg more rent and taxes) and digital surrogate activities are probably your only respite from this hell if you live in a metropolitan area.
I go walking through parks early in the morning and all I see is roasties jogging, people walking their dogs and bongs made out of Gatorade bottles and garden hose lying on the ground. Unless you're 60 and enjoy playing croquet or you enjoy shopping at the mall and being a consumer, there is almost nothing in life you can enjoy unless you're a successful, well-adjusted person by society's standards. If you use PC gaming as a cope you're basically a caged animal that's been given a ball to play around with, don't rationalise it by saying it helps your brain.