I’m still fighting it as well. My logic for downsizing my iPP 12.9, and buying the 11” was that it was small enough to be really portable, whereas I felt like my 12.9 never left the desk.
In all honesty though, I rarely take my 11” pro off the desk, unless I need to bring it with me somewhere. I wind up using my phone a lot when I’m sitting in the recliner or on the couch, and definitely when I’m laying in bed.
I don’t know if a mini would fill that void, or if I would still use my phone just because it’s so small and convenient. Right now I’m not willing to spend the money for a new mini to find out, and I’ve been unsuccessful at finding a 4.