Since the original M&B I've seen a huge difference between public beta-tested games and internally tested games. From what I've seen in the launch issues with the latest DLC, Bannerlord can only profit from an external beta like M&B1/Warband (even though the latter beta was MP only). Not all bugs will be squished but fresh-eyes on the project will ensure a much more polished release.
Correct me if I'm wrong btw - but I consider M&B the first "early access" game (I can't find any other game that can claim this), still remember it was called "shareware", and when "crowdfunding"/"kickstarter" had yet to exist. Now they are everywhere, and I've played enough alphas/betas to come to a conclusion that based on my experiences - external betas make a huge difference. It's the future, and heck, the development model started from M&B (again, correct me if I'm wrong)
AAA devs have been dropping the ball as of late, making room for indie expansion.
I hope Taleworlds remember their roots, continue their excellent fanbase / developer interaction, and utilise its community like it did in the beginning. For the record I'm still very proud of them, from a husband/wife team to a respected developer.