Maybe designers should research why we are not redesigning things like power sockets, forks, knives, shoelaces every other month.

But we are...

I have seen quite a few redesign for fork and knifes for people with disability. It is also very dismissive, just because current sockets works, it does not mean there is no space for improvement for more secure, or reliable socket, and the way we found out if such thing exist is with design! Like this one...

One could call the desktop environment (OS frontend) an appliance, and we certainly redesign appliances and scheduling software frequently.