To be fair, in OS games, the fights in which you're outnumbered 4 to 1 are in most cases fights that either aren't meant to be fought (even though you *can* try, if you want), or at least not meant to be fought the typical way in which you just walk up to an enemy and start fighting. They are meant to be very tough or pretty much impossible if you tackle them the normal way. Encounters in OS games are mostly designed and balanced based on the premise that the entire enemy team fight together.
Even in the original Baldur's Gate games, there is a "shout" mechanics which signals enemies who haven't spotted you yet to turn hostile (if they are not hostile by default) and also to move toward the enemy who is being attacked. It was just limited by range and also not used all the time. The strategy in which we lure enemies one by one to a safe distance before dispatching them is a bit of a shenanigan: it is unrealistic and a flaw in AI - unless there is indeed a great distance between two enemies.
So ideally, provoking an enemy should drag their allies nearby into the fight too, unless there is a good reason for that not to happen, such as because of distance, or if the game implements some "stealth" elements that include vision cone and silent takedowns and all that, as if you're playing a top-down Hitman game (I would actually love to see a solid implementation of stealth approach to combat in BG3).
Also, in some cases, it is because of plot reason that an entire area or faction turn hostile as soon as one of them turns hostile. There's no helping this.
Last edited by Try2Handing; 07/06/19 10:12 PM.