The only “e-sport” I’ve enjoyed watching was the earlier seasons of the Mythic Dungeon International in World of Warcraft, which was mostly interesting from a perspective of seeing people do stuff you’ve done, but trying to really min-max it, taking a lot of risks, fucking up, and so on. Like a lot of sports, as people got better at it, and the rules tighter, in later seasons, it got a lot less fun to watch, for me at least. Also my wife was watching it with me (she’s also a WoW player) and that made it a lot more fun.
Regarding sports in general, I find I never watch them alone given the choice - I’m just not interested. I might watch a clip of a particularly spectacular play or something, and really enjoy it (same for e-sports), but watch match after match by myself or, worse, with a “virtual audience” of screaming racist morons in Twitch? No thanks - but I do think Twitch’s audience of morons does serve a similar role to the crowd at a big sporting event for a lot of people. Not for me though.