It does, but that requires a production pipeline that is daunting and difficult to put together for someone just starting out (if you're trying to address the concern for more practiced hands, of course this is less of an issue). Picking up people just to proof an in-progress work can be futzy, having a full-fledged actual editor onboard is so much more. It also requires a more deliberate pace, and when you're worried about "are people even going to like this?", getting that all squared away early very much feels like putting a cart before the horse.
Also, the most important thing for writing support staff isn't even necessarily how good they are, but how well they fit together with you and your story. I've heard tales of people brought in to help edit xianxia/xuanhuan-style stories in preparation for Amazon release, and while their resumes were impressive their fit with the culture was atrocious. There's a difference between "dial down the pathetic on X character" (probably some good advice had I been given it early on for a certain first arc faux protagonist) and "omg cut this entirely, it's a problematic exploitation of Y group" (which, for me, is useless garbage because the audience for X&X stories doesn't care about that stuff; they eat up massacres and lewdness and punching both up and down). Forming a rapport to avoid that kind of screw-up takes time and requires something to be there to begin with, too.
If you are a meticulous writer with a long tail on your work, having a bona fide editor is the thing. Totally. Absolutely. Although even they can misread and misstep; it's a form of protection but it isn't absolute. Also, you can finagle it a bit by having something like a Patreon and using them as a beta audience (I never did this because (a) impostor syndrome (b) wanting that big ABORT button available that I eventually did use). Guys just starting out will have none of that, though, and you can't very well strap it to a newbie either (that would be cruel and unusual to do to would-be editors, for one). A lot of the worst stuff can and will get tempered by just writing, failing, and writing some more (and then deciding to do better or to hang up your hat and go into something less stressful like forming your own superhero squad).
Some promising people will wash out entirely, no doubt about it, but writing isn't just about the quality of the prose or anything else. The barrier to being a writer versus an "aspiring writer" is to sit down and do actual writing; the rest is an improvement from there, but people have to take that step and then stay the course in the first place.