As surprising as it may seem, some might still want to use the supplied charger because they don't have spare ones powerful enough for the laptop.
I have a Macbook with Magsafe and 6 USB-C phone / small devices chargers. None of them could power a Frame.work so I cannot just use another charger because it's usb-c
Spot on, last time I bought a laptop it came with a charger, so that's why I was referring to this and why I was concerned about its compatibility with my power plugs.
As I was still unable to order a frame.work yet I wasn't aware that frame.work didn't include by default a charger, so your point makes perfect sense.
In this case then I'll probably end up buying a charger — because none of them in my possession is able to cope with the watts required.