Interest on reserves is very much still in place[0]. Open Market Operations haven't been a thing since shortly after the 2008 Financial Crisis.
https://www.federalreserve.gov/monetarypolicy/reserve-balanc...
The OMC desk is still there trading. How is that not "a thing?"
Alas, you are right. Compare also https://www.cato.org/working-paper/floored