They still have a centralised box but each connection goes in a ring from the box and back to it again. This way you can use thinner wire for the same total capacity.

Sadly it carried on for far too long, my house built in the nineties has it.

UK central fuse boxes don't have a fuse/RCD per socket. For example, mine has common ones for the kitchen, downstairs sockets, upstairs sockets, and all lighting -separate ones only for the boiler and cooker.

The wiring system was designed during world war II when there was a copper shortage and someone calculated that it used less to use larger conductors to several sockets than to run smaller individual ones to each socket.

TR in the US makes sockets harder to use, but I have never heard anyone complain about TR in the UK, as the earth/ground pin is always present, and is physically longer than the live and neutral, so mechanically it is reliable and unnoticeable.

“Just baby proof” means remembering to keep those little plastic covers in place in every outlet. That doesn’t seem like superior usability.

I was talking about TR in the UK. You have to push it just right, it's noisy, and you have to use force.

That’s not my experience but it’d be interesting to from others on the matter.