That said, it's much more difficult to play with more worms than your opponent

Either your worms are apart and your opponent can easily wreak havor or your worms are in close proximity, in which case your opponent doesn't have to be accurate.
I'm still in favour of having random turn order in the scheme to at least make it more difficult to abuse turn order even though last time around, people told me things were fine (even right after complaining about turn order abuse)