Looking at precedence of The Last Stand and how scattered X-Men: Apocalypse felt. While I don't hate Apocalypse, it isn't very good and I get why people hate it. And this movie doesn't appear to have learned its lesson. It is going to have tons of characters that will need to be introduced, fighting for the bare minimum of screen time.
What the franchise needs to do is narrow its narrative focus. It can go in space, but the plot should be clean and character-based. One of the reasons DOFP worked so well is that other than the future sequences, it was really only focused on four or five major characters in 1973 and they were all revolving around a central point of conflict: Mystique and her desire to assassinate Trask. Magneto's plot line was in reaction to that and led to him to go about solving this problem in his own, villainy way.
We now know that this movie will be introducing Dazzler and several other new mutants, keep Magneto in the thick of it even though he left the mansion, and now will possibly be introducing Genosha and/or Asteroid M, and/or the Hellfire Club while definitely trying to do the cosmic Phoenix Saga right, complete with the Shi'Ar empire and a presumable gladiator match in space as the finale (which is necessary for doing the Phoenix Saga right). This also means Lilandra's Imperial Guard need to have some kind of presence and minimal development so they aren't just special effects.
That is an awful lot for one movie to handle, particularly for a first-time director. In fact, it is more top heavy than Apocalypse. And after Apocalypse, I had hoped they learned their lesson, but this appears to be doubling down on the same mistakes while also mirroring one of the biggest ones in The Last Stand, which was attempting to do the Phoenix Saga and something else. Call me a pessimist, but I have tried to give this movie and Kinberg the benefit of the doubt for months, yet this is just sounding like the same old mistakes from previous debacles, which is so frustrating.