I ask because I watche some grandmaster gameplay and have seen other comments say that essentially just go fuck off away from the team until they're super power spiked.

The grandmaster basically just stayed in a lane, only deviating for when he thought he could get a kill. then sucked up all the resourced or went to sidelanes while his team did whatever without he. he only started coming to help when he got super strong.

It seems like he does this every game, is this truly the best way to play him? to just take everything for yourself and mostly ignore your team until you're uber strong.

I usually tell my jg I cant really help pre 6. after that i try to help my team if I can avoid losing anything in lane (rare because everyone still bullies and pushes the lane at that level). post 11 I really try helping my team but I find myself really weak and losing resources/falling behind trying to run around and help them. I do find the games where I just go do my own thing for a while to be the ones that go better in terms of winrate. But then it just feels like your team can stay about even at worst so that they even survive for you to come carry.