The breaking up of definitive series is not my cup of tea either.
Agreed, a design cannot be appreciated when it lacks concordance, in my opinion.
Obviously, there are cases for specialist Album Pages, that are suggested by Geoff, and specialist pages shown by the Postmaster GS here on this forum.
I just hope my opinions are considered before making, what in lots of cases, is an important step, when one begins collecting, esp in a worldwide sense.
As we can see by another member here "Angore", I believe he uses Steiner, and Scott, then, when beginning to specialise in Brit. Machins, purchased the Gibbons specialist catalogue, and continued on from there.
I believe this is a wise route to follow.
I use Michel for dedicated Gulf states etc, because Scott and Gibbons are wanting in that area.
I do believe in an overall Worldwide sense, Scott is the leader in general catalogue listings, in an easy used format, attractive font, and usable catalogue sizes / formats, easily understood world wide.
They will never contest the specialist catalogues from individual countries, but they were not designed for that.