I went through a Guitar Hero phase back when you couldn't take two steps without another GH game or accessory popping you in the teeth. I got pretty good, but never managed any consistency beyond a few songs I could manage on Hard. What this guy did is nothing short of insane. TL;DW? 100%'ing an extremely long and fast song on Expert difficulty. My hot take? The time, effort and dedication it had to have taken to practice for this is time, effort and dedication that should have been spent doing literally anything else. It wasn't even my time, and I feel a bit of anger that it was wasted.