And that (the bolded) is just one of the main reasons why the line as a whole seems to be failing (in this covid-era, nothing is going to sell as consistently high as they were before...and things were looking dismal even before Covid-2020).
From the threads here and elsewhere it seems as though the majority of fans are only invested in their personal favourites. If Jean is in a book, then the Jean-fans are buying, regardless if the book is mediocre or less than. Same with the Storm fans, the Scott fans etc...today's readers seem hardly interested in ALL the Mutants' Story as a whole. And that's just sad.
I have my personal favourites (plural) but I also love and am invested in how HiX-Man and Co. are pushing the entire X-franchise and where this era is going.