There are two questions to consider: What are we trying to accomplish with a stamina system? and Is there a better way to accomplish this?
IMO, one of the flaws in Warband is that there is never sufficient reason not to wear the heaviest armor you can afford. Likewise, there is little reason (really, little choice) but to upgrade your troops to the heaviest option available. Even at full difficulty, 100 Swadian Knights make you invincible in field battles. It there any reason to have Sarranid Skirmishers other then as a stepping stone to Master Archer? If I wanted infantry with throwing weapons I'd start down the Nord tree, Jarids piercing damage notwithstanding.
I think that is the problem which mods and VC are trying to address by adding a stamina system; to create a role for lighter armored troops. I think that VC's stamina system, along with the Armor Penalty, did an ok to good job. But I don't what that to be the way Bannerlord addresses the issue. Whatever the solution is, it needs to be a core part of combat, not something that can be switched on or off. The stamina system (at least as implemented in VC) feels too much like "look at this game mechanic".
I think a better solution, at least in part, would be to give useful battlefield roles to different types of units. Obviously we don't know how things will actually shake out in the end, but it's looking like they are heading in that direction with the sergeant system, multiplayer captain mode and quotes like
Bannerlord is working to make control of the battlefield more important, so that skirmishing is usually a prelude to a clash