I honestly don’t see what the big deal is with these Freeview numbers. I know on my TV, you can move channels around as you wish, and I’d imagine that that’s the case with most Freeview boxes/TV sets? I’m sure you can even delete channels as well.
It’s seems to be a feature that is vanishing from models now. I’ve got 10 year old Sonys where you can edit and re allocate, but I bought a Sammy last year and you can’t. Only, you can because you can save the tuning data to USB stick, use third party software to edit, and then blast it back into the telly. ( At your own risk etc) .
I do find it annoying you can’t. If you bought a radio and presets 1-5 were locked to BBC R1-5 you wouldn’t be happy, in fact no one would!
I think that the days of changing channel number are 'numbered' literally.
The commercial pay-TV operators have fixed channel numbers and no editing functionality for the end user, and I suspect Freesat and Freeview similarly now expect EPG
channel numbers to remain fixed (I haven't checked the D-Book stuff to check whether it's a requirement though)
I guess the big difference between Radio and TV is that there is far more regional variety in radio, and mobile reception where cars travel between areas, is more widespread, so the Radio vs TV analogy isn't quite the same. (Plus Radio EPG is very niche on DAB/FM)