One of my funnier experiences on Discord was to see 3 premades form in LFG, all appear on my team, and when I remarked on the fact, two members of said premades told me (abusively) no premades were on the field.
I'd agree the coordinated premades on Aether are typically between 0-2 in a given match. The fact that a single one can have such a profound impact on the texture of that match is still a problem IMO. But outright banning them strikes me as a blunt instrument at this point, and better solutions are available.