I had quite a few times where they would set up on a hill and rather annoyingly pepper my retinue with arrows and try to pull back when I got close to them. Other times they would just flat out charged as would your infantry if you were using a mod that used a battle cam system. The thing is though, the AI was still functional. Was it bare bones? Yes, but it worked well enough and didn't break the immersion or frustrate you due to HORRIBLE friendly AI.
If you want to see something frustrating hop in Bannerlord, get a retinue of 200 elite troops, die and watch how fast they fall even if they manage to pull ahead of the enemies in kills before you do so. I have used mods like "Warbandlord" to make elite unites worth a damn by overhauling the rather **** armor system and rebalancing health values closer to vanilla Warband. You will lose dozens of troops within a minute of going down, even if they don't route. No idea why, they just...die. It is kind of absurd.