Yep I remember that post. Was trying to figure out how to work US Armor grow with a group of about 300 or so people who may or may not have military skills needed to guide armor warfare grow. I always through MBTs are just a bridge too far with 1940ish tech even with knowhow from the future. The turreted TD/Infantry Support Tank only became buyable as larger guns could be mounted in medium tanks which are idea infantry support tanks. Even with future information to guide the US, I don't see them as something that can be built till the late 40s assuming you can get Congress to give up the money. I'm looking more at a stop gap measure to get the US to have a tank that could be better built to deal with other tanks and still have great infantry support armor units.
Heard and understood. In which case the M4A3E8 (76mm) is your Jack-of-all-trades with the M36B2 (90mm) as the heavy hitting specialist TD.