Prophesy of Pendor was great, the mod I almost exclusively played. Saxondragon, the lead, was a professor of game design at a university in the midwest as I recall. Didn't he make a follow-up mod with his students as a course? I remember him planning to.
Brytenwalda was also fun and innovative, they were the guys that later made Viking Conquest. That was not Taleworlds. Brytenwalda was set in post-Arthuian and Roman Britain, and before cavalry was much of a thing, stand in the shield wall! I remember talking with Arnoldo on the forums, they were largely Portuguese historical reenactors iirc. Maybe why their stuff was so immersive.
I am one of those who has been playing M&B since there was M&B for thousands of hours. There was so much Taleworlds had to draw from either lore or gameplay not just from M&B and Warband but from the expansions and mods. The mods especially gave what barebones M&B has always lacked, immersion. I never went back to native Warband once the mods started rolling in.
With all of that to build from, Bannerlord almost feels like it started from scratch instead. I get no sense that there is much recognition or understanding of what players loved about those games and that it is going to find its way into Warband. And some of the more interesting features that Taleworlds had announced for Bannerlord don't seem to be happening either.
'New engine' doesn't cut it from that point of view. Also, while everyone is loving the new graphics, I find everybody I talk to looks like the Pillsbury Doughboy. Chunky.
Count me among those who would like to be given some reason for optimism, because I haven't much atm.