Something was wrong with their design of the last MacBook Airs with USB-C charging port. I'm very gentle with my electronics and yet the charging port broke two times in a row (fixed under warranty). My daughter's MacBook Air had the same internal break as well (fixed under warranty).

I suspect they didn't properly support the internals so the force of inserting a USB-C plug caused a crack or break over time (and a short time!).

I went out and bought cheap "MagSafe" like USB-C connectors for my machines and my kids (in college) machines. I personally WELCOME the return to MagSafe!