The distribution of different DC voltages that any devices in your home use is already pretty small. USB combo outlets are already common… You get a pretty good capture of consumer devices just with 5V.
Toss a 12V in there as well and you’ve probably now got >%95 of a typical households devices covered.
Also, given a standard, manufacturing will follow to design around the constraints, so over time that 95% would grow as designs move away from “non-standard” voltages to voltages that are available on a standard DC grid.
The distribution of different DC voltages that any devices in your home use is already pretty small. USB combo outlets are already common… You get a pretty good capture of consumer devices just with 5V.
Toss a 12V in there as well and you’ve probably now got >%95 of a typical households devices covered.
Also, given a standard, manufacturing will follow to design around the constraints, so over time that 95% would grow as designs move away from “non-standard” voltages to voltages that are available on a standard DC grid.