While i agree that an auto-directional block should be added for the more casual players, as someone who's coming to Bannerlord as not only a Warband but also a Mordhau veteran I strongly encourage anyone who relies on things like auto-block to "get gud" (and no, im not being condescending).
I noticed VERY quickly that when I would replay Warband after my time spent in Mordhau that directional blocks were quite literally a breeze. Learning to read the different animations was a bit of a chore given how clunky we all know Warband is, but once I learned to read said clunky animations, I performed way better than I ever had before.
Another thing that Mordhau had also taught me which translated to Warband/Bannerlord pretty well was the fact that, while games are indeed a fun and casual pass time that we use to wind down, sometimes we still need to take it a bit seriously and push ourselves to do better.
Just my 2 cents on the matter.