As for the rest - it's just that starcraft is mentioned very often in this discussion. Maybe too often.
My point boils down to this: if Relic allows mirrors and makes mirror maps, it would be steps towards SC, not just steps towards some e-sports requirements.
"Steps towards SC" is hardly the same as turning CoH into SC. Dawn of War II had mirror matches, swarms of aliens, and space marines, and yet it didn't turn into SC. So there's no worry of CoH turning into SC just because it has mirror matches.
Why can't CoH be itself (very asymmetrical game, both factions- and map-wise) and still be good for competitive purposes? The problem with BO1s and maxVP-choices can be solved by putting more effort into map-making and longtime support. FFS, given the appropriate man-hours budget you can make north ango playable for wehr and north langres playable for amis, no need to be genius to do that. If (at least) ranked maps allow both factions to play with even odds of success, the old tourney system will work nice.
Relic is never going to be able to do this. Let's just be honest with ourselves. Making maps is hard. Making non-mirrored maps is harder. Relic made Kangaroo Carriers and thought those were a great idea. If your argument against mirror matches is "the game can be perfect and a perfect game doesn't need them" then you're wrong, because the game won't be perfect, and competitive players who have a lot on the line in a tournament aren't going to be happy if they're forced into a side they don't want on a map that doesn't favor that side.
What CoH2 needs for the competitive purposes is:
1) balance (and constant support)
2) tools (spectator mode, modern replay system, after-game analysis, modern matching system)
3) uniqueness of gameplay.
And there is no NEED for mirror matches.
There is no NEED for anything if you mean "this game can't happen without this feature." CoH 2 could be a tic-tac-toe game with ZERO features and it would still exist. We're talking about what CoH 2 could use to make it a better game. Relic has already said we're not getting spectator mode, and I doubt the replay system is going to be anything other than what we had in CoH/DoW 2. And frankly we likely won't get perfect balance either. But even if we did get all this stuff, mirror matches would be nice too.
Why can't you just do what's done in chess? Coin toss picks side, players then alternate for best of three.
If one player happens to be not so good at Ostheer and is unlucky and gets them twice... tough! The best players are those who master both factions, not simply one.
Because chess is played on mirrored maps. If we can have mirrored maps but no mirror matches that would be OK - not as good, but better than nothing. But all the "WHAT ABOUT MY IMMERSION I WANT TO PRETEND IT'S WORLD WAR 2" people probably won't like mirrored maps either.