I will preface this by saying that I am playing devil's advocate in this post, and that I'm not certain about the effectiveness or ineffectiveness of jobbers. I personally don't need them, but I'm open to the idea that they work for a large portion of people.
At a certain point, doesn't the jobber status make the character useless from a story perspective? Like Baraka for example, can't say I've ever seen him win a fight. So I look at him in MK11 and I think, what's the point? I know you can't beat anyone on the roster, so why are you even here? From a narrative perspective that is. If Baraka is matched up against Johnny or Cassie, I already know they're going to fuck him up, so there's no tension.
That's why pro wrestling hasn't worked for me the past decade. It's just so obvious who Vince is trying to push, so there is no tension.
Edit: I'm happy Baraka is in the game because I he's monstrous and the fewer basic humans (looking at the five special forces characters) in the game the better. I just hope he doesn't get beat down by every character in the story.