The call up is premature.
Dominguez wasn't really playing well at AA until late July and August.
They pushed him to AAA and while he's done well there -- it's only 8 games at that level.
Part of the reason to bring him up to the Major League roster is to retain interest in the Major League club. But part of it probably has to do with Harrison Bader not being a good enough hitter this season. They cut him, and as good as Bader can be defensively, Dominguez can probably match that or play close to it. So why not take a chance and let Dominguez get some at-bats at this level to prepare for 2024?
Rookies struggle all the time, so that's what fans should expect out of Jasson Dominguez.
It'd be a miracle if he comes up and has a Shane Spencer-type September.