FIY, the original telecom rack equipment been standardised on 48V since time immemorial.

So, at 48V you can simply use off the shelf telecom power supplies

I've been trying to find cheap 48v power supplies for 1A and less telcom gear, but they seem to be pretty spendy. Cheaper to buy old gear that includes the PSU than order the PSU itself.

Actually it seems to me that standardization hampers the last bit of efficiency. Just one example that grinds my gears is the LEDs on the reference designs. Nobody needs these but there they are, drawing current 24x7 in a dark warehouse in the middle of nowhere.

Can’t they just be turned off after power-on, or flipped on as needed?