First of all notice there's a difference between 1v1, 2v2 and 3v3. There's also a huge gap between AT and random or low and higher "skill" (you don't need to be asian with +150 apm to be here).
Balance is made around 1v1, somehow 2v2 and trying to fix exploitable things which might be seen on larger game modes. Balance is also made about thinking on the expected performance of a unit been used properly (positioning, kitting, etc.) which generally implies a certain degree of skill. You need to combine this with changes that doesn't affect as much the top but are QoL for lower levels (for example the USF changes from last year).
With that been said, you are right that there are certain units need a revamp or update to keep up with the new factions n changes, but they are far from been the worst or in bad shape. Rather it's more on a stale state.
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From the core army, more or less:
-T1 as a whole needs an improvement. Penals buff and changed, snipers and M3 tweaked a little bit (tweak doesn't necessarily mean a buff rather than a change on some aspects)
-Maxims need to be support weapons and conscripts main line inf (need SLIGHTLY better scaling/upgrades, which doesn't mean weapons) and not the other way round.
-T34-76 needs to be a bit more reliable with MGs (imo) and the Su85 needs to be less of a medium destroyer to help feel the gap of dealing a bit better with heavier tanks.
Agree or disagree on the changes, i'll say some units need to be more reliable to be use.
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Corrections
But, I think, balance should mean, that game is equially hard for both sides - axis and allies. Right now it is hard only for allies and only for USSR and USF. All others, including UKF now can just relax and be happy.
Randumbs 3v3+ is easier for axis than allies due to the lack of coordination and ease of scaling to the late game when they can defend at least 50% of the map. At lower brackets people tend to be less effective on the offensive which hinders the aggressive nature of USF and SU and their early game.
Ok, Im really ready to listen their opinion "from them personally". Maybe they would even agree with me, don't you think? I don't want to read "retelling of someone's opinion from no-names".
From the people who have their playercard available or are known (notice this is just a broad selection) and have commented here:
-Highfive, Mirage, Aero, Iron Emperor, Insanehoshi, Tristan, Zarok, Blalord, myself