I think Sombra became a mess largely because of how the pacing of Overwatch has shifted.

While OW 1 had more one-shots or devastating burst damage, the games were a lot slower. I would not go to say "methodical" because that carries implications of intellect and "past better" but there was more thoughts being "filled" at breather points. Granted said process was more like this scene in Brooklyn 99:

Jake Peralta: I'm quick at math.

Captain Ray Holt: Okay what's 38 x 76?

Jake Peralta: 24.

Captain Ray Holt: That's not even close.

Jake Peralta: But it was quick.

Sombra feels lacking in the current form. I don't mean sustainable or meta or viability, but rather her niche and identity feel very much in conflict with the current state of the game. She has to be quicker to meet her goal since her saboteur abilities worked far better in slower pacing but now she needs to make it quick in her loop.

Which makes me wonder how Sombra would be modified in the modern era. I do believe her rework is going to be big. Like I have gut feeling that has been proven wrong before that Sombra will have a bigger rework, like an actual kit-redesign.