Yawn.
A mini/micro is 20x the volume of a Pi.
Use-case matters, I use an SFF as a file server and media player, and a Pi for PiHole, Tailscale, etc.
I've also setup a Pi as a dash cam with wifi so it auto uploads when I get home. Can't see using an SFF/Mini/Micro the same way.
Yes, the Pi costs more per MFLOP or whatever performance metric you want to use, but it excels in compactness.
Stop trying to use a hammer as a shovel.