I think another thing is that MOBA's have downtime. You need to walk to places, you need to back, buy items, etc, etc. It's been a while since I played Starcraft, but my memories of it were basically that if you weren't doing things at literally every moment, you were probably going to get beat. You could try and use better macro, and tactical understanding but you'd eventually run up against someone who was equivalent and had better micro/apm and just lose. Which meant that every match basically felt like a sprint from start to finish, which was exhausting. Eventually it got to a point where it was hard to jump into a match because I just wanted to game and not go all out. I had pre-emptive anxiety/exhaustion about the intensity of a match. A moba can still feed that competitive desire and has moments of intensity, but it feels much more balanced than RTS' ever did to me.