Kidding aside, I think this is one of their key differentiators from the MBA line. It's partly the MagSafe itself, and partly that you have an extra USB port open even when charging.
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.
Seriously though. Every feature someone says is missing and should have been added would be another $100 on the cost. This is already likely a low margin product meant of someone who's only using a browser and maybe a few apps.