Aren't the Bloodsuckers in STALKER 2 a prime example of terrible enemy design?

The bloodsuckers in this game are absolutely overpowered, they are:
-Fast and agile, and can even turn invisible
-A tough bullet sponge
-Big damage dealers, basically a two-hit kill

And on top of that there isn't really a clear way or definitive formula to deal with them, its design in STALKER 2 seems to be purely based off of brute force.

Enemies like these are usually used as a way to punish the player, or at the very least, as lazy mini-bosses, which in turn would grant the player a reward for beating them.
Sadly though, neither of those are the case with this game, in this case, the game seems to throw this enemy towards the player however it wants, sometimes even going as far as throwing FOUR at once, making the player drain their resources, emptying their ammo, health items and breaking their gear, which requires a lot of the in-game currency to fix in most cases.

This leads me to a question, what is the point of them in this game? they clearly aren't designed to be fun, so what's really their point? is it just a big design oversight? there are a handful of moments where this game makes me wonder if it was properly play-tested, but this one is the biggest of them all, whose idea was this?

With that said, i want to clarify that not everything is like that in this game, there's a lot of good stuff in it, and so far I've been loving it, the atmosphere is insane, the dialogue is quite unique, the story is engaging, and lots of other gameplay-related things i find cool.