If you look at your house, almost every single piece of cable, pipe or joint, and so on is standardized so that you can connect stuff from different manufacturers and it will fit and not blow up on you. Then the correct ways to connect stuff together are standardized. Then the people who do these things are going through standardized certification.
You don't need to buy different wall sockets to connect up different appliances because the sockets are standardized and your country decided to mandate that all appliances must follow specific rules and choose only from available standardized options when connecting to AC.
See, it is so ubiquitous that you don't think about it.
You don't need to think about it because somebody at some point stepped in and said that it is not ok to have every manufacturer to have their own standard and homeowners to bear the cost of navigating those multiple standards.
There is already a lot of mandates like that.
If you look at your house, almost every single piece of cable, pipe or joint, and so on is standardized so that you can connect stuff from different manufacturers and it will fit and not blow up on you. Then the correct ways to connect stuff together are standardized. Then the people who do these things are going through standardized certification.
You don't need to buy different wall sockets to connect up different appliances because the sockets are standardized and your country decided to mandate that all appliances must follow specific rules and choose only from available standardized options when connecting to AC.
See, it is so ubiquitous that you don't think about it.
You don't need to think about it because somebody at some point stepped in and said that it is not ok to have every manufacturer to have their own standard and homeowners to bear the cost of navigating those multiple standards.