Allies have a number a great AT option like ISU-152, SU-85, Su-76, T-34/85, M36, M10, Persing, FF AEC and AT weapon in an number of infantry their infantry.
Saying they "have 1 TD for to do it all" is simply not true, misleading and it's also bad design.
Your 2nd part is correct, but how the hell is a Pershing, 85s or AEC TDs ? Might as well say that any medium tank is a great AT option if they flank.
Light vehicles, light tanks, mediums, advanced mediums and heavy tanks.
In the same way that OH lacks vehicle options to deal with light tanks (non doc), other factions have lost effectiveness in their low-mid tier AT vehicles (Su76-Stug-M10) or have them more focused on dealing with heavy tanks.
If the game drags pass the light stage, you don't want Pumas, AEC, Su76s or Stuart. Non doctrinally, Axis has 2 options to deal with medium to heavy tanks in either different effective ways. Stug/JPIV for mediums and PV for heavier armored vehicles. Su85, Jackson and FF have seen their power shift towards dealing with heavier vehicles even though they still can deal with mediums.
IS-2 is in worse state then KT for almost a year, whatever you can do to KT, you can do the same to IS-2.
PRE BUFF IS2 was in a worst state than pre nerf KT for sure and maybe equal to KT post nerf. Right now IS2 > KT, specially on 1v1.
Where did i said it? maybe i mean the some best top 20 players, like angreifen?
here u go and look how bad IS2 is and how great KT is:
https://www.youtube.com/watch?v=bylm5bZEZ5A
Floating +400 muni when you have Ober/Fall/2 Volks. Angreifen threw that game after the IS2 base rush. He had the lead, comp wise, specially after sniping the Su85. Then the Katy snipes the Obers (lucky that the rocket impact the carcass of the Su85) and it's a downfall from then on. Keeps sending single squads around the map, while Ikab defends with the IS2. Then sends his single 75% HP JPIV to chase 75% HP IS2 and loses it. While also losing another Volk squad to the Katyusha (he back off towards the volley).
He could had either throw his whole army headfront and use his offmap and win that game, or spam grenades on every engagements and win the map control. Instead he kept pushing with half his army across the whole map while losing squad here and there. When the KT arrived, he already had lost half his army and it's vet.
At the end, he rush his PIV towards a zone he already knew there were mines and losses the game. The 2 Penals getting behind the un micro KT and satcheling to dead was inconsequential towards the result of the match.
PD: just to be clear. KT is bad, but not too far off. Remove drunken IS2 gunner phenomenon and it would be fine. 1v1, heavy wonders doesn't work as well so don't expect it to be a "come back" unit.
IS2 is not such a meme unit after the buffs but i still think the alternatives are stronger (T3485s) cause you don't have to play the waiting game.
If any allied TDs is overperforming against simple mediums, there's always the option to reduce accuracy and instead increase the size of all advance mediums and heavies. Which TBH i don't think it's necessary.