These reasons mostly seem like junk aside from the Halo 5 issues. At this point in time having a different gamertag would have virtually no effect on his "brand" The people that care know who he is and it's not like it would have made him change Youtube or Twitch accounts. As for issues building a PC, maybe he should have done some actual research before building a custom PC. Any amount of knowledge will tell you it's slightly more complicated than putting pieces together.

Reason 5 is whatever. If he was passionate about making content he'd probably continue to do so even if he had to scale way back. There's a lot of breathing room between trying to make a living off of gaming content and just doing it as a hobby.

I won't deny he could play the game well, but he always came off as a prick just about every time I saw him anywhere online, so whatever. RIP