If clients are paying you, they like what they see. Photography is an art form. Your clients like your art. This is all that counts.
If you were fixing CARS without the proper training something may be legitimately said about your lack of skill and disapproval of charging customers. But you’re not.
Good luck, and keep shooting.
I don’t understand this comment. The whole premise of this site is to highlight pro photography which is lacking. I completely understand if that’s not your thing, but it makes me wonder why you are here in the first place.