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Well, Floris Mod Pack is better than Vanilla for sure, but it is not THAT different. Get the extended version of Floris, the only one that's worth something.
The Pendor Update is interesting, but I really wish they made the .py files available. I really want to add some scripts from Floris into PoP.
Bannerlord really needs to be a new kind of game. Actually, let me elaborate. From a gameplay perspective, Warband had two parts, one quite good - the tactical fight itself - and one quite bad - the stategic map gameplay. Now the strategic map gameplay has to go, it was a grindy abomination, ugly and pointless. Replace it with something else, something with a lot of quests, something like Heroes of Might and Magic or Total War.
The tactical fight itself just needs a bit of tweaking for the silly cavalry vs cavalry fights. Those too were a clusterfucky clusterfuck.
Add a proper editor for dialogs, quests, units and stats, and for the graphical resourses, use a system similar to steam workshop. There, now you have the greatest game ever made.