Earlier quoted context omitted.
Yeah that's a lot of "gold wire gives better sound" vibes. Yes, all of that stuff can make a slight difference, but at the end it's not going to be a determining factor in your skill.
In computer gaming (RTS / FPS) equipment matter, especially in FPS. Not to mention your internet connection. I would guesstimate about 100% more effectiveness compared to a subpar setup. Meaning all else equal the guy with the better setup would win an encounter twice as often. You also need to know about all of the configuration steps to maximize advantage. What might look superhuman on youtube for instance may very…
What does that mean? You mean if player A can beat player B 70% of the time, then once player A upgrades his equipment he'll beat player B 140% of the time?
Do you mean that if player A can beat player B 20% of the time, then after upgrading his equipment his win rate will jump to 60%?
Neither of those seems at all plausible, and one is gibberish, but those are the only two ways I can think of to interpret "win an encounter twice as often".