Taleworlds obviouslly isn't going to show things that don't work, but even recently they've added more bugs into warband with patches and failed to fix some basic design flaws (khergits don't fight properly in sieges due to a single misplaced stat, starving out enemies in sieges is impossible, broken source code release after viking conquest due to a nonsensical typo).
There are hundreds more minor issues which would take days to explain, but were mostly fixed in the Diplomacy mod. Needless to say I'm cautious about expecting every feature to function as intended even if they have 20 patches, and I'm cautious about expecting the game to be absent of garing design flaws.
If I go by the example of warband which was in development from c.2004 all the way to 2015, bannerlord is going to be quite unpolished.