The t34/76 would still be a choice though. You could build it for 310 mp 100 fuel, but wouldn't have to pay tech costs. This would give you a viable target if you decide to go for doctrinal armor, giving you a cheap, spammable medium tank to supplement t4 builds, that will not scale into late game at all.
IMO, this should be the way doctrinal armor works. It shouldn't be a straight upgrade over existing units, it should give you access to a unit to supplement you forces (ISU), or give you access to a weaker, but viable replacement to your basic units (t34/76).
Also, talking about elite armored, the reason we don't see it used as often is due to the fact that most of OKW's doctrines provide players with game changers like Pak43s and Jagdtigers. Elite armored is not currently one of the best doctrines because it doesnt bring anything new to the battle, it just increases the micro tax on armor, making them more powerful (This is my favorite doctrine for that reason). If the pz4 battlegroup was a choice for ostheer, I can assure you that it would be used more often.
Elite Armored is crap. None of the abilities it has are worth a damn and anyone who defends it must not actually ever use it.
The Commander artillery is expensive (and awful), and you already are paying for the commander. The repair is expensive AND bugged/broken, the armor detection ability is as useless as the Soviet one, and the Ausf J come in far to late and for 210 fuel which is literally 50 fuel less than a KT which is far more of a game changer.
People will always just make the best units, people will never not make the best units. Adding shit units to the game will not encourage people to use shit units. If you gave every faction every unit from every commander the meta would change not one bit except you might see a little less cookie cutterness.
If you can make a
better unit with out a commander
what is the point of taking a commander that gives you worse units. It's why nobody uses Irregulars, it's why Partisans are just a gimmick, and it's why people who use armored company are brain damaged.