I have the 6/128 model and can never seem to get below around 1.1GB free at any given time according to RAM Truth no matter what I do, either opening apps manually or filling it with an app like Memory Fill.
Battery savings is a discussion for another thread. The problem is that with ram management turned off, it is still impossible to use the ram we payed for. This is behavior that is obviously intended to be left up to the user to control, yet is not functioning.
I am on the latest update with the Jan security patch.