The 13” model is only $300 more than the M4 Mac Mini whether comparing the base models or the 32GB RAM options. That’s a pretty good value for a battery, screen, webcam, trackpad, and keyboard. The main thing you give up is the ability to connect a third large display when at your desktop, a few ports, and support for higher than 60Hz refresh rate on an external display.
I think it's highly unlikely that the M4 mac is actually limited to 60Hz for all external displays. I'm running a 1440 ultrawide at 100Hz on an M2 right now. Instead this is likely the maximum px*Hz configuration supported, and smaller or fewer monitors are supported at higher Hz.
I don't know the refresh rate, but my M2 MBA is plugged to a 70" TV with no problem. Perhaps it's not at the highest resolution possible, but I can't see pixels from where I sit.
