I don't think anyone meant you did the newer ones, though the clarification is useful.
The question remains, of course: WHY!
Yep, it was just a clarification, not a disclaimer

Well, I believe different people like to customize things to their own liking, and that's something I think is good.
Splitting the board into two (main+cartridges) may have sense. In fact, it's something we did with the spectrum version back in 2016 or 2017, but it never got much attention. I estimate around some 100-200 boards, compared to the 3000+ single-board zx-dandanators
However, making the Elite with a different memory pinout of the DES was, IMHO, a mistake. One motivated probably by a lack of communication between the two groups, not intentionally. That's why, I believe, the new Elite+ now supports DES memories as well.
In any case, I think both projects are nice and their finishing detail is awesome.
I've been asked several times to customize dandanators (ZX and CPC) with different features and functionalities, but it's something I'm not usually inclined to address, since it creates, unavoidably, fragmentation and confussion in many users.