Just because i'm able to do hard maps doesn't mean i wont burn out in the process, like for me, i get an A on a 4k map and i find my arms dead from exhaustion.
When you play a hard map that's like, the max thing you can barely S or A you get a feel that your fore arms are burning and feeling tired, keep that feeling for too long, and you end up unable to play the map properly because your arms get really tired from the process of playing a difficult map. and yes in some cases you don't really rust but that's like for easy maps you don't really feel burn out from playing (unless it's like a 97-98% on a jumpstream map), but for maps that reaches your limits that's when you feel that you're draining stamina.
When you play a hard map that's like, the max thing you can barely S or A you get a feel that your fore arms are burning and feeling tired, keep that feeling for too long, and you end up unable to play the map properly because your arms get really tired from the process of playing a difficult map. and yes in some cases you don't really rust but that's like for easy maps you don't really feel burn out from playing (unless it's like a 97-98% on a jumpstream map), but for maps that reaches your limits that's when you feel that you're draining stamina.