but I could swear I fight way more multistack reinforcement battles in EB than I ever did in M2TW

I agree it's a shame because huge armies are more suited to the Roman time frame.

Also if a Rome MTW2 mod wanted to make use of that feature they would have to hold off till the fall....and then start making it ( correct me if I'm wrong). So we are talking a long wait. But that is worth waiting for. Fielding a legion that actually had 5000 soldiers. Awesome.