I found this older article about how active suspension was on the table for 2021, but was discarded. Basically the reason was that if they allowed active suspension it would result in highly optimized aero that would have a narrow performance window and would put a risk a key criteria which is to allow cars to get close and pass each others.
https://www.racefans.net/2019/07/19/...nsion-in-2021/
Richard