Editing breaths in my voice overs used to plague me all the time. I literally would spend hours taking out breaths because I thought they sounded horrible and made the voice over seem amateurish.
But I quickly realized that it wasn't the breaths I needed to be paying attention to, but the type of voice over I was doing.
Let me explain ... Was I narrating an audiobook or doing a car commercial?
Both are voice overs but have a defined style of narration. There are always exceptions to the rule, but one (audiobook) should have breaths and one (car commercial) should not.
As I grew as a practitioner of audio, I learned how to differentiate between the two.
So ... there are times, especially during long form narration, elearning, conversational reads in longer form, etc. that should have breaths. It is natural to breath while talking and will actually sound quite odd if excluded.
But, shorter spots, quick reads, commercials, etc. should usually be without them.
It is all about knowing the context of the voice over and the style in which you are narrating it.
So, make sure you are aware of the style you are reading and if using breaths in that particular genre is expected or not.