This could be resolved with difficulty settings where a more intelligent AI is enabled at higher levels.
Unfortunately, there are indications that they're working on dumbing down the AI even more in order to accommodate a console release.
Thats the problem of BL combat. Its hybrid of formation and duel system, both of these systems are only servicable at best (BL formation vs TW formation; BL duel vs Mordhau, Kingdom Come or Jedi academy dueling system) and sometimes clash with each other. For example solo or group of infantry spearmen vs single rider is terminator level efficient, but the moment it becomes cavalry formation vs infantry formation spearmen become much worse because instead of aiming generally in front of them / in the direction of cav formation and stabbing they are aiming at individual riders and waiting for the best possible moment trying to aim at individual riders. Same aplies to ranged units they fire slowly because they are sniping individuals instead of shooting at formation, even at distance, and if for whatever reason their desired target is not visible (for example when another enemy or ally is in front of him) they will become confused and not shoot until their target is vissible again or sometimes they might eventually switch target.
YES!
They have an inadequate hybrid combat system that doesn't really work in squad combat or formation combat, then built one AI to govern both behaviors which inevitably breaks down as code for the one clashes with code for the other.
There are ways to make both the dueling and the formation combat more workable, but that doesn't seem to be anywhere on their radar - let alone developing completely separate AI to govern the entirely different ideal behavior between arena dueling vs. set-piece battles.
And - again - this behavior existed in mods for WB. Spearmen would march in formation and brace against cavalry (and could be automatically positioned at the flanks!). Archers would fire in volleys against masses of troops. Swordsmen would form multi-angle shieldwalls that point up to cover against plunging fire. Skirmishers would reliably toss their payloads and GTFO. The fact that BL is a step down from what existed years ago in volunteer mods is ridiculous.
ONE thing that would make combat infinitely more realistic (and spears much better!) is if your shield didn't magically turn into a useless hologram the minute you release the RMB and if spears/swords could be thrusted over/under/around one's own raised shield. Also spears should be less effective at parrying but also harder to parry against... actually the same thing should apply to all weapons with reach and 2H weapons should provide for brief stagger/knockback.
I'm definitely an amateur and not an expert, but my understanding is that weapons like greatswords and maces and the like were the province of the heavily-armored + trained + conditioned.... the only advantage of a greatsword over S&B being that nobody wants to get within your reach and the countermeasure to even longer enemy weapons would be enough armor to push in closer.
This is all a pipe dream, I guess. I might as well be wishing for other never-gonna-happens like using the X key to shift stances (something that would ALSO provide versatility for dueling/formations). Or even a button that allows your PC to clip into formations and follow automatically.