The biggest gap in the existing series is the one-two punch of the Romulan War and the founding of the Federation, which we only missed due to ENT's cancellation. Finding some way back into that era, beyond Riker's holodeck program, would be number one on my wishlist.
Yes! I've been thinking for a while that Discovery season 1 is the Last Jedi of Star Trek -- except of course that Star Trek started with that alienating move for its new era.
Could you elaborate?