Grass is always greener on the other side; it's always easier to imagine aim being better because you take for granted the decisionmaking you already have, even the stuff that seems simple. Whether intentionally or not, you end up imagining that + aim. What all aim no brain really looks like is someone who can flick better than everyone else wide swinging a close corner every round and dying due to angle disadvantage, or a reyna running through a viper mollie and orb thinking he can find someone on site to kill and dismiss, or a smokes player dying first every round trying to take duels when he should live (unless you're playing Clove ig)
The worst part is that if you have good enough aim you can get away with a lot of these things, and because it works 20% of the time, it becomes harder of a habit for people to break because they end up trying to make it work rather than finding a more reasonable alternative