The resurrection of Jean Grey should be an actual story instead of whatever nonsense Byrne did back in the day. Byrne, not Claremont. The issue is that resurrecting Jean Grey was a mistake that shouldn't have happened at all. Either time.
One of the many important lessons we've collectively forgotten from the Claremont run was that you can kill X-Men and leave them dead because none of them sans Wolverine are that vital to the brand. Thank you, Thunderbird.