I don't really see any downside to a proprietary connector if you also have the option to charge over USB-C as well.
MagSafe + 2 USB C, all on the left
vs
3 USB C, 2 on one side and 1 on the other
I don't care much about MagSafe, but it is sometimes annoying to have to plug everything on the left. If given the option, I might pick the extra USB (which could also be used for data/monitor/etc. when not being used for charging, of course.
I charge my M2 air with a usb-c cable.
Soooo, continue to charge the M5 Air with a USB-C cable? What's your objection here?
Just look for a2337 usb-c port replacement.
Magsafe on laptops is so much better than any other option: zero force "insertion", convenient breakaway if tripped over causing no damage to either side. Magsafe is fantastic.