I feel like people are wilfully ignoring that level scaling the gyms plus open world means you don’t have a set order to the gyms in the first place.
It’s not gyms 1-8 anymore but a group of 8 gyms that you can do in any order. So difficulty of each gym isn’t reliant on a set order but literally just on which one is your next gym you pick.
The idea you can go straight to the eighth gym in scarlet is a bit of a laugh - that’s going to take a lot of grinding. Why bother?
If you go for the eighth gym first and there’s no level scaling, do we still have the gym restrictions (eg can’t control Pokémon over a certain level until you get X or Y gym badge) in place? If so - god this will not be fun to watch or attempt!