The brick is still USB-c and the macbooks still charge on all usb-c ports. The magsafe cable is just a nice to have. Also frees up one of your USB ports for use.

My MagSafe MBP still accepts charge via USB-C. In fact I don't know that I've used MagSafe at all with it other than a handful of times borrowing someone else's charger.

got a 100W desktop charger and a proper cable, works great. magsafe charger is collecting dust and is used only when travelling.