The game leans more on the action RPG side, with just elements of strategy sprinkled in here and there. The video in the OP is great, and I think that it is awesome that people are making these types of mods and that the game supports them, even at this early stage, but I think that something along those lines would be too complex to use as a player and draw the game out too much, ultimately detracting from the fast-paced action and gameplay.
This post is a little disheartening to read. Bannerlord would definitely benefit from the use of tactics being more effective for both player and AI commanders, even fairly small changes to current mechanics could improve this.
Currently AI acts more individually than as an army and it's very noticeable and impossible to manage at certain points in battle, for example if I tell a line of archers to face a certain direction they will still turn and engage flanking cavalry...even if it's only one or two enemies, when really they should be prioritising the mass of infantry or archers I've told them to face.
AI commanders will often place archers behind infantry so they're unable to fire, even when the enemy is far from engaging. Even worse is when AI commanders mix ranged and infantry units together in a blob...what is the point in having archers if they can't have space to fire? The same can be said for most skirmisher units which AI always mix with normal infantry.
Cavalry often always charges in first by themselves, even if they're completely out numbered...it would be far more effective if they charged after infantry lines were clashing, to harass archers or impede enemy cavalry.
Formations still struggle to stay together when on the move. As soon as the charge command is issued the AI homes in pretty much on the same target rather than keeping formation. I'm aware the advance command allows units to stay in formation better but currently any unit with a throwing weapon wont approach an enemy any closer than throwing distance which renders them useless.
I think one of the reasons using commands seems too in depth at the moment is because you have to micro manage each type of unit individually (ranged, infantry, skirmishers, cavalry, shock troops), it really becomes a chore if you want each unit type to be most effective. This becomes extremely difficult to deal with once your troops are clashing with the enemy. It would be a lot simpler to save a few custom formations that you know work for your army composition and be able to move your troops as a whole like in OP's vid.