Speedy tanks meta in the lategame?

I am seeing a lot of this lately. 1600+ elo, 3v3 and 4v4.

Basically, people previously complained about the Grant and the Brumbar being too tough, but now more and more high-level players are switching to the late game fast tank blob.

For DAK, it's either Flampanzer 3 and Marder 3 or Panzer 3 spam. You have probably seen DAK armies with 1 - 2 Panzerpios and the rest are vehicles.

For UKF, it's Crusader spam. Literally, 5 Crusaders per player.

For USF, it's Sherman 76 (not the EZ8 nor the Hellcat, surprisingly). This unit isn't that fast, but quite easy to mass and effective in large number.

Wehr literally has nothing and can only defend against the tank blob with slower stuff.

Against fast tank blob, AT guns are useless. Tanks charging in, nuke on AT, it's over. Considering all light vehicles were nerfed because it was too easy to mass and control them, I think all the fast tanks, as well as some DAK vehicle upgrades, could use a few nerfs to keep them in check, especially in team games where slower armies wouldn't be able to reinforce their teammates in time.