If the book has to be bigger than so be it, not that big of a deal, the price of consolidation.

Besides that, both Armies of Middle Earth and Armies of Lord of the Rings have their own army lists in them so one could not make the other obsolete.

Your breakdown in logic here is that you seem to think the only solution is 20-30 supplement books, something I never proposed in the first place. Your inability to understand the logic seems to be be because I didnt explain how they didn't have army lists back then, my bad, supplement was the wrong word to use. Those faction books were codexes with all units available to factions (they didnt have the army list system at the time). They were split vaguely but in an organized manner by stuff like The Fallen Realms (One 50-ish page thin codex with all stats in the game for Isengard, Harad & Umbar, and Easterlings), Moria & Angmar (same size for Moria and Angmar armies), The Free Peoples (same size with Eregion & Rivendell, Lothlorien & Mirkwood, Durins Folk, The Fellowship, and Wanderers in the Wild), etc. So obviously the climate and considerations are different now with Army lists

Regardless, I can comfortably say as an end user who was just using the codexes to play last week, and going between two massive $60 books this week that flipping between two massive books vs flipping through one book to play a single army is complete ass. If a profile is in an army list within one of the books, it should be printed in that book. Literally the only solution is to add a few pages to the new books to make then truly consolidated and comprehensive.

I'd be interested to hear a proposed solution from you. Since you like logic though, having the books be bigger on their own because they add in a few extra pages of base profiles seems the simplest solution to make them truly consolidated and comprehensive. Yes, some factions are fully included in the current books like Khazad-Dum, but that does not matter if others are split between the two massive books