Again, a stigma. The fact of the matter is, CoH2 just doesn't have the playerbase to exclusively cater to the few who class themselves as "pro" or "elite" because they play more competitive modes. It's the kind of mindset that is devastating for the longevity of the game.
as a fellow 3v3+ hero, I understand your feeling.
but these "pros" have a point due to several facts.
coh2's competitiveness only extends to 1v1 and 2v2 max. look at maps for example. 4v4 heroes once only had 4 maps and 1 veto to tinkle with. now we have more maps but they are terribly small; going from 1v1 - 4v4, in all maps but general mud, you have less than half of the space individually as you did in 1v1 setting. look how the mud tech was introduced: on hill331. look at one of the new 3v3-4v4 map (the one with 5 vps). look how it has the huge castle that might as well be a competitiveness cancer. why do these new shits kept on being introduced first to the 3v3+ maps?
look how caches and initial open blitz were designed. completely designed only for 1v1 and 1v1 only.
which relate to cheeseness. the cheeseness of units/tactics only gets worse as game mode gets larger. again, because relic designed this game to be a competitive 1v1 game and not competitive 1v1-4v4 game.
and generally speaking, more casual players (therefore worse players) play 3v3+. i means, if you are like me and you switch from 2v2 to 3v3 and vice versa frequently, the difference is unmistakable.
which is not to say that a really intense 3v3+ games where pro players coordinate and play to the max are not competitive matches. i have had those games from time to time since 2013. but only in like 1 in 40-50 games. while when i play 2v2, i get skilled opponents almost 1 out of 2 to 5 games.