You can at least give broad directives (whether to be "Offensive, Defensive, or Neutral" in terms of aggression) and take the lead with an army of your own, or hang behind your own battle lines to clean up your vassals' mistakes, but it is certainly a hands-off experience by then outside of personally leading troops to take cities and castles.
Personally, I've only done one playthrough to unification thus far, and I must say my biggest complaints are the incessant crashing (mainly during and after transitioning to the "scenes" to besiege cities/castles--note, I'm playing on PS4) and the lack of challenge beyond a certain point. The latter is kind of inevitable since it's really just cleaning up the remnants once you're overwhelmingly powerful, but the former is something I hope can be cleaned up with patches.
Overall, I had a rather euphoric time with Bannerlord over a 50-odd year adventure spanning two generations, but I am inclined to complain about the inability to separate archers from crossbowmen (crucial since the latter has such little ammo by comparison yet tend to carry shields, so they are good secondary infantrymen but mixed with archers they're squandered) and the way reinforcements is handled (thankfully, this issue is said to be fixed by the 1.1.0 beta patch, so I'm patiently awaiting this issue getting fixed). I went into as somebody who played a few unification playthroughs of Warband and thus expected something similar; I'm happy to say Bannerlord appears to be largely an upgrade off its predecessor since it appeals to numerous different gameplay genres simultaneously and thus seems to really match my niches of taste. If these issues can be solved, I can tolerate a boring final phase of gameplay since everything up the point where victory is inevitable is very exciting and tumultuous. Stability is this game's (on PS4 at least) biggest issue; once that's fixed, I'd then like to see crossbowmen and archers separable since, otherwise, it's best to have either only-archers or only-crossbows.