I think your and the previous post bring up some good points, but remember, ~ arguabley ~ the ABC Inhumans is part of the universe that included
Agents of Shield. I am not sure, but some aspects of that continuity may no longer be part of the MCU; a different verse? So if they wanted some sense of starting over, that would be it. A different continuity.
But clearly it is not going to be easy, maybe, with so much of the Terrigen story in the last season or several in Agents.
I want to trust Marvel to do the right thing. We know they are bringing 'mutants', X-gene back/into MCU
Also Eternals and their scope.
So Inhumans needs to be done well.