I'm curious why that is a loophole at all. Post offices are traditionally closed on Sundays all over Europe as far as I know, so sending or retrieving packages on Sunday is not a fundamental right or something. (And if you really want it, there are the automated lockers nowadays.)

Ah right. Well normal restaurants are all open too.

Personally I would let grocery stores stay open, but having Zabka, Carrefour Express, etc. open is a decent compromise.