We see follow-ups to those however. Scott seems to still be dealing with the effects of Schism and always being called / thought wrong. I think JDW even mentioned something about Scott atoning, which triggered some who felt he had nothing to atone for. Unless there's another story with him I forget because it hasn't been mentioned. lol
Jean has come back, and sadly her death, relationship with Scott, and what she remembers regarding Jeen's experiences hasn't been addressed yet. If it's not, then that does render the story null & void. But too soon to say nobody will address it. Sadly she & Scott came back right at the start of this transitional period of waiting-for-Hickman-filler.
Emma & Magneto seem to be anti-villains who go in & out of the X-Men. They have X's on the uniforms in Powers of X.
But stories that can be considered moot are the ones that happened but just got ignored later, had no follow-up, and characters don't even seem to acknowledge that it happened. It's something that can be rendered or considered non-canon. For example
Bunn's work. Ignoring him is what the X-Office does best really. So everything that happened in his Uncanny has been rendered moot & useless. The AXIS story line. All the characters have been reset, and chances are all the stories with the characters who remained inverted longer will be ignored, so that story can, and probably will, be ignored going forward.
The Toad x Husk romance. I am fine with this one. But as an example when Toad lost Husk, he was so upset he couldn't stay at the school. Then in a following story, he's back at the school with no explanation. Meanwhile, his & Husk's affair probably won't come up again.
Jean x Bishop. It's still debated if AoX will matter at all, and if it doesn't, than true to form, everything that happened here was filler since it won't effect the characters going forward.
Then some minis can be considered filler given how many events of said series are isolated and just appear to be extra side-stories. But they can be used to show different sides to a character without disrupting a main title. So those are tricky in some cases.