No, you just need better tools to do so. Of course, having humans reviewing your book can help increase the quality, but that has nothing to do with having a publisher.
> I have found kindle books that come from a reputable publisher are MUCH higher quality
You are also biased because there are a LOT of really bad books published by traditional publishers anyway.
Tools won't find plot holes, they won't find one-dimensional characters, they won't find pacing problems.
Having a publisher means someone cares about their reputation, that there are risks, that resources are devoted to quality.
To be clear, I'm not saying that self-publishing means you will get a terrible book.
It's just that self-publishing is inclusive, published books are exclusive, and that changes the statistics. It's hard to locate a good book in a sea of self-published books where there are no quality bars.
No, you just need better tools to do so. Of course, having humans reviewing your book can help increase the quality, but that has nothing to do with having a publisher.
> I have found kindle books that come from a reputable publisher are MUCH higher quality
You are also biased because there are a LOT of really bad books published by traditional publishers anyway.