The people trying to scare everyone about inflation are the ones who the poor people owe the big pile of cash, and they have a very large megaphone.
Can you point me to some middle class people who are just sitting on a huge pile of cash? I'm a pretty standard middle class person and the vast majority of my net worth is tied up in a 401k, and if it wasn't there it'd be in a house that would be seriously outpacing inflation.
Also, to your earlier point:
> Poor people don't have standing debts but rather revolving ones, and so their debt scales with inflation.
So at worst that's a wash.
[1] https://abcnews.go.com/US/10-americans-struggle-cover-400-em...
Now I agree having all the benefits from productivity gains going to the people who aren't working for them is some bullshit, but that's not the same as wages going down when you account for inflation.