There’s probably not much else to say that hasn’t been already said, but since I’ve been busy and tend to procrastinate to an extent, I feel that I should mention this point regarding the scaling for legendaries in particular
One of, if not, the main reason for legendaries having been scaled the way they were prior to the split is because the vast majority of them either don’t have anti feats to conflict with the tiers they got, or they don’t have suggested limits from the feats they have displayed in order to argue against scaling.
In other words, their existing feats are either casual (Ex: The Life Trio or Light Trio) or they have no anti feats to go against receiving scaling. Especially since many legendaries tiers are based more on scaling in the first place.
So unless we go with the species pages suggestion that was brought up earlier, I don’t see the issue with bringing back how legendaries were scaled before, with minor alterations if anything.