ASTONISHING stands on its own well enough.
Slogging through X-history might be too onerous because continuity has never been its strength. It's one thing to endure Claremont's dialogue and prose on a monthly basis when we had nothing else (stylistically speaking) to get our mutant fix, but now that other writers have refined the style of storytelling Claremont's schtick may come off as pedestrian and stilted. One of the major appeals of the Whedon and Morrison runs is BECAUSE they were NOT trapped by over-exposition. Which is odd for me to say, knowing Whedon and knowing Morrison.
Claremont wrote during an era of monthly comics, in which each month he endeavored to introduce all his characters so you could kinda pick up the series anywhere. These days stories are more parsed in binge-read format where there's less need to constantly remind readers who these people are and what they can do.
It would be like drinking RC Cola to prepare yourself for how good Coke is. Like any good porn star, you want to go straight to the Coke.