Yeah, the "each movie is set in a new decade" (First Class is 1962, Days of Future Past is 1973, Apocalypse is 1983, Dark Phoenix is 1992) thing is a nice-seeming gimmick that has a few side-effects: nobody seems to age, and you basically leave huge amounts of handwaved, assumed events between each movie, which is easy to screw up.Haven’t seen the movie but wiki tells me it’s set 9 years after Apocalypse. So it’s not unreasonable to expect relationships between characters to have developed off screen, even if it’s still unsatisfying when a movie appears to expect you to be invested in a relationship you’ve never seen before.
Actually given each movie since First Class has jumped forward years so that we’ve now covered 3 decades of X-Men history, I think it’s kind of weird how some of the characters haven’t appeared to age much at all since the early 60s.
Magneto was maybe 10 in the intro to First Class, around 1943/1944. So he's around 30 in First Class. Fair enough. That means he's pushing 60 in Dark Phoenix.. Xavier is of similar age, maybe a little younger, and there's an obvious sense of visual continuity in his hair across the series (plus, he eventually ages into Patrick Stewart, who doesn't age). Mystique at least has the excuse of being an unaging shapeshifter to still look like a woman in her late 20s when she's in her 50s... but Beast is pretty much the same age as her, and he's aged well too. He doesn't have many years left to transform into Kelsey Grammar. The younger actors are easier - Scott, Jean, Kurt, and Ororo are teens in the 80s, so they're twenty-somethings now, and they'd be the thirty-somethings we saw in the first X-Men movie in a decade or so.
Also, carrying on the "one a decade" thing means that technically the hypothetical one after Dark Phoenix catches up with the original X-Men movie (Early 2000s, albeit with a different status quo, thanks to Days of Future Past).
Incidentally, the actress playing Dazzler was Halston Sage, who played Lieutenant Alara Kitan in The Orville.And the thing is, for the first act of the movie, it looked like things would be ... fun. Weird, right? Like, you got costumes, space adventure, a FREAKING DAZZLER CAMEO ...