Fallen Angels sold well because after HOXPOX the X-Men books were/are on a whole other level of hype than when they were on Ressurxtion era. RED wasn't a failure in any way.
Not everyone likes Jean, we have to get used
anyway she is less problematic than majority of x-men
They know Jean gets money to the company, but doesn't want to do more than the bare minimum for the character and let Hickman keep his mischaracterizationMaybe, I feel like some people at Marvel got too used to Jean being dead.