Based on everything I've read on it in this thread so far, it seems like it's pretty much hurting the little guys the most.
Whether this is malicious or intentional or just incompetent or something I honestly don't know.
Donald Trump's deeds and behaviour is just about the only place where I find myself unable to apply Hanlon's Razor.
I think if you spend a few minutes reading about the origin of this change, it's pretty obvious this was a sacrificial lamb for the TCJA to pass. It gave them ~5 years of noticeable extra tax revenue they could use to balance the other provisions. So today, 8 years later, it's not doing anyone any good (and removing it, unless done carefully, might essentially reverse that 5 years of extra revenue, but all in a single year).