Early on, Chris Carter was mostly known as a showrunner, not a writer, and the strength of the writing staff, who later went on to other important productions, covered his deficits. Morgan and Spotnitz were superb and parlayed their time on the long running series into later significant work.
When Carter was asked about lifting from Quatermass, he originally denied it until the chorus of other hardcore fans and critics became so insistent that it was painfully obvious.
And heck I even enjoyed his Millenium series and the half baked Lone Gunmen series too.
The X Files became as important a cultural icon as Breaking Bad did later and notably an unknown Vince Gilligan worked on both shows, first as a writer than as a a terrific showrunner.
The show though resulted in typecasting both principal actors due to immediate recognition. Luckily the BBC took chances on Anderson and she did exemplary work beginning with the House of Mirth, the Petal and the Rose, the Fall etc.
DD became a terrible self-parody when his real life sex addiction famously blew up his marriage and then he rode the coattails of that to make Californication. How bizarre and grotesque for a talented still young promising actor to do.
The reboot should never have been remade so we could fondly recall the show... warts and all...for it significantly affected American cultural history.
In a way, this is akin to rebooting Twin Peaks although that result was far worse.
Take a look at the subpar failed pilot The After which Chris Carter tried to get off the ground.
https://www.hollywoodreporter.com/live-feed/chris-carter-why-amazon-scrapped-856240
GA maintained good relations with the fanbase in spite of being typecast. She always maintained she'd be willing to do more if the script was good. But they weren't,right? The second X Files movie added nothing to the mytharc but just milked it. Which is what CC is doing now from nostalgic fanboys.
DD on the other hand alienated the fanbase (like the pun?) by taking a dump on the idea of UFOs and government conspiracy. It was his infamous William Shatner SNL moment execpt he had the gall to say it at X Files conventions...ad nauseum.
Only a week ago it came out millions were spent recently on DoD testimony on unexplained aerial phenomena caught on flight recorders.