Magsafe for macbooks is the most intelligent charger connector ever made, illogically they stop using it, I agree with you, is good to see they're bringing back the idea. Regards the fully close devices, can be done and use external pogo connectors (or whatever are they called, the copper dots on some devices/tables to attach keyboards)

I remember when I decide to remove the keyboard for my 2009 13" macbook pro "only for fun" hahaha