Quite a few youtube creators and indie filmmakers use editors. It's mainly a function of income. Teenagers in LA with a 10k monthly allowance hire them all the time, anyone working with the actual profits that microbudget or smaller narrative films generate typically don't. Some youtubers collaborate by combining skillsets for shared revenue, you'll see it in the credits fairly often.
With a significant number of more serious indie filmmakers, the lack of an external editor is often just a logical choice. You've put x amount of time and money into a film, and it doesn't make sense to introduce a person without all the investment in your project to do a job that can ultimately ruin it and cause all the investment to be lost.
In a situation where you had a genuinely talented editor, It's definitely a positive, for the exact same reason many avoid it. A detached perspective on the source material can lead to editing decisions that ultimately benefit the film. For that to work though, you'd typically need a caliber of editor beyond the price range of a microbudget film.
Lastly, I'd say that indies don't hire editors as much because it's not a very expensive or difficult thing to learn or execute yourself. I'm definitely not saying it's unskilled, but if you're the type of person who would undertake the challenge of filming a movie out of pocket, you've already made a commitment to effort considerably beyond 60 hours of coursework and a download of DaVinci. People often underestimate the skill involved, as they do with many aspects of production, like grading, foley, etc, but with editing specifically (assuming you mean time and sequence editing) it's something you can learn to do yourself with a reasonable amount of study and practice.
There are editing jobs so simple that you can automate them now, like I did with the Showreel.video site. (see the video "Time" available here on Indietalk) I can put together a montage or music video in less than 30 seconds at this point. I've been building a far more competent robot video editor, but it's a very complex solve that requires a lot of training and intelligence, so it's far from production ready in my opinion. Here's a sample of an early test of that. It kind of works. I watched a person watching it and they forgot about the tech and got interested in the documentary itself. That was all I needed to see to know that I could improve it 5x over the next 6 months and have an instant solve for all but the highest level tasks. It lets me focus on the many other aspects like script, visual design, color, foley, and music, that I'm more interested in spending limited available time on.