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1- I think that's the whole point of heavies vs mediums. 2x mediums trade micro tax but they will have more firepower (most tanks do 160dmg) and positional advantage. The ideal trade is 1 heavy for 1 medium tank and for that to happen it all depends on what kind of support each army brings into the mix.
2- They saw a resurgence in team game use, the moment they overbuffed them. Prior to that, you didn't see heavies on 3v3+ outside of anecdotal usage. And that has been how things were ALL the way back to when WFA was not released yet and Tiger/IS2 were not limited to one.
Let me remind you that whole "TD boost" was at the expense of been less effective against medium tanks. It's the other way round.
Most TDs got nerfed against mediums (mostly RoF) so, no it's not that "TD boost" destroyed medium play. Medium play has not been the main way to play 3v3+ for quite a long time.
I think we will have to agree to disagree here. I don't think a solution is possible, because the moment they tried to do so (and having a patch designed by people who are 3v3+ mains like Sander/Sturm behind them as opposed as what we had historically) we had the previous heavy meta reigning chaos on ALL modes.
After 7 years and with possible no future patch in sight (or at most 1), i don't think it's worth trying to FORCE heavies back into 3v3+ again. If we had patches every 2/3 months, sure. It's like wasting resources into "fixing" Soviets T1 (specially Penals). There are better things to invest time on IMO.
Suggestions and changes have to be as small and elegant as possible.