Oh really? I have a friend whose massively into Esports - super nerd and he has some great multi picks. You're probably right to be honest, if you arent massively into the sport and understand how teams perform, single sports bets are most likely better in the long run.
Don't get me wrong, you can still win some nice money when you win multiples and maybe betting esports is different; but I still think in the long end it is better to only bet on singles. How much multiples have you not placed, where always 1 pick (and a lot the pick would the lowest odd) fails.