OK, so you don't need lore frozen in stone at some arbitrary date to be happy with a 5E adaptation of a classic setting; you just want continuations that are lore-compatible with the material that came before, rather than reboots that start the setting over from scratch. By that standard, SCAG and Eberron are fine (though both meet that requirement in different ways), Ravenloft and Spelljammer are not.
When you said you agree that they should "copy-paste the entirety of the older setting books", as
@Levistus's_Leviathan and
@Remathilis asked you about, it sounded like you wanted no changes at all from some ideal-to-you version of the setting. A treatment, I should add, which was
not how the major 2E settings were handled during their runs. (For example, 2E Ravenloft added to 1E Ravenloft, and 3E Ravenloft added to 2E Ravenloft; none took the older edition lore as is and stuck strictly to the previous status quo.)