Now that database diagrams are back in SSMS 18.1, it's time to rise the challenge.

Currently, a memory optimized table cannot be added to a database diagram (they do not appear in the tables selector).
Without a graphical schema presentation it is more difficoult to have an overall vision.

Furthermore, we cannot benefit of the other goodies of db diagrams like creating a foreign key with drag&drop with no need to write tedious

ALTER TABLE blah blah WITH CHECK ADD CONSTRAINT blah blah blah FOREIGN KEY(blah blah blah ...) REFERENCES blah blah blah blah

for hundreds of tables.

I think it would be the right time to implement them.