That's why both units will be given either a cost decrease and/or some anti-infantry capabilities.
Sure, if you always play Brits (because, fuck Soviets/USF) and you always go Hammer (because, fuck Anvil), then, yes. Perhaps you have the right tools to play keep-up with Super-TDs (not 100% sure after Hammer nerfs, though).
So, I'm curious. When you play as Soviets or USF, and you encounter either the Elefant or the JT in 4v4, and somebody else in the team has fielded either a Brummbar or a King Tiger, how do you counter that?
If your only answer is "oh, I don't have to deal with that, because I pick doctrine X", then this proves my point.
If the only counter-pick to a strategy is forcing a particular commander choice, then you have a self-reinforcing dominant meta.
I have nothing against you, if you are OK with using Jaeger Armor Commander, day-in, day-out. However, what's not OK is to expect it's OK to limit other people's choices when they have to face Jaeger Armor.
I wish you would answer the other questions I posed before your own questions but whatever.
If I'm playing 4v4 ransoms I have to be ok with potentially being paired against an arrange team. A commander compliments a faction not defines it. If I pick Jaeger armor or fortified armor and choose my play style, the enemy can decide to pick a commander that directly counters mine, or pick a strategy that forces me to react to there commander. If the Allies can counter my commander units (ex. elephant or Croc) with stock units then it's good design. All commanders should be this way. So far I think we can agree on this.
The next question is whether or not the axis or allies have all the tools to counter both the stock units and doctrinal of the other. It goes without saying that more expensive units should require the same amount of opposition resource wise to counter it(ex. One SU85 can hard counter a p4 and two can counter a tiger). An SU85 is a tank destroyer so it excels at destroying tanks. Mediums are more generalists so they are cheap and decent at many things. Elephants are HEAVY TANK destroyers because heavy tanks have a hard to flanking them. This is not so with medium tanks which are far more mobile, cheaper and with the same HP.
Now to answer your question: "how would I counter the elephant supported by brummbarr with Soviets or USFs stock units?
Assuming I am countering with equal amount of resources and they have a brummbarr and elephant combo = 720mp 245fuel + 420 mp 150fuel I'll have a total of 1140mp and 395 fuel
I'd probably use t34s as soviets = 1200mp and I'd engage other places of the map and force them to react. They'd have the option to either ignore me and suffer map control, send the KT, or send both the KT and elephant. I'd look for a decent opportunity to rush the elephant and get around it with the t34s when the elephant starts moving I'd bring in the SU85 to beginning picking at the KT. I'd do my best to get behind the elephant without taking almuch dmg by using smoke or shot blockers. When a t34 gets low on health I'd use ram.
For the Americans it's much the same using 4 Shermans smoke to screen the elephant and isolate it. And take it down.
Allies need to capitalize on their own mobility and their oppositions lack of it.
I understand there are other factors going on in 4v4s as well but that's the approach I would take. If I could convince my Allies to join in the assault it would greatly increase the chances of winning that battle which would likely lead to winning the match as well. Axis have more expensive quality tanks and Allies have cheaper spammable tanks. Use them the way they were designed.
Also, why would you suggest giving Anti infantry capabilities to a TD?