"Fox understood the X-Men more than Marvel ever will..."

Um the Inhumans are in the MCU. Inhumans is a spinoff of Agents of Shield which is in the MCU. The Netflix series are also in the MCU. They make reference to a lot of happenings in the movies.

IGN Inhumans

Now Joss says it's not but one director saying it isn't doesn't make it true. Sif and Nick have been on Agents. Phil provided the hellacarrier to Nick.

List of Marvel Cinematic Universe Television Series Wikipedia