That was the case before for many comics and many superhero comics in particular from the 1930s up to the 1960s but that was when it was a new medium and for superheroes, a new genre so it attracted pioneers as they were most likely fans of other things. Recently, we have a growing number of non-comics fans doing comic books such as Gabby Rivera doing Marvel’s America Chavez that it’s a good thing to have a more outside perspective when it comes to writing or at least having more experience and interest in other things that leads to something more interesting than if it were made by a lifelong fan.
With lifelong fans you get something of a fanfiction sensibility in the sense of wanting to write stories for one’s favourite programme or comic book that they bring in a lot of their headcanons to the stories they end up writing for. It’s glorified fanfiction in a sense and in a way a nonfan writer would hardly be at the very least. With fan writers there’s the risk of stylistic and narrative inbreeding, especially if the stories become really fannish and not at all appealing to people other than themselves. While there are people accusing of Marvel pandering to the SJWs when it hired nonfan writers, it did the right thing in a way when it comes to reaching out talent in unexpected places.
Especially when you have them learning the ropes and hows of characters they’re working on that it’s all new and fresh territory for them, rather than fannish familiarity with the source material and the desire to work on it. Familiarity doesn’t just breed contempt, it also breeds obsession and narrowmindedness for some writers. That’s where nonfan writers score, they bring in something genuinely new and different to the source material in a way a fan wouldn’t because of how new and green they are to the stories they’re working on.
They have a quality of greenness fan writers lack, green and new towards the source material and willing to learn and try things out on their own. It’s not that fan writers can’t do anything radical and different to a story, though I think the quality fan writers have is a greater deal of fannish passion for the things they grew up on whereas with nonfan writers, they could’ve grown up with something else instead and this gets reflected in the way they write stories. A nonfan writer has the quality of approaching the source material in a way a fan writer wouldn’t, an air of greenness a fan doesn’t have.
Nonfan writers could be fans of something else, Gabby Rivera might probably be a fan of children’s literature growing up just as Stan Lee was a fan of pulp fiction and it shows in their sensibilities though I’ve yet to read their works. Jack Kirby could’ve been a baseball fan, though that’s an unfounded guess but even then that’s telling when it comes to the differences between those who barely grew up with the source material at the very least and those who did. It’s not that fan writers are any less creative, but they’re not as green as nonfan writers are.
Nonfan writers were the norm in superhero comics and the trend’s reversing itself to some extent if Rivera’s any indication, though the habit of hiring superhero fans as writers has made superhero comics very entrenched in fannishness that it’s insular to anybody else who isn’t a big fan. This even resulted in characters who are fans themselves, which reeks of pandering to a narrow audience. This fannishness drove away nonfans and possibly why Arrow’s ratings have declined significantly.
It’s not that fans can’t bring anything new to whatever story they write for, but nonfan writers have an air of novelty and greenness that refreshes a story in a way fannishness doesn’t.