I don't claim to do fine woodworking, either, but I do the best I can do. There are usually (always?) mistakes made. Some of them can and should be repaired. Deciding whether a mistake can be successfully repaired is always a personal decision. Even if the end user cannot see arepair that isn't compatable with good craftsmanship, I know it's there. I have done the glue/sawdust thing in the past but as I've progressed with my woodworking, my standards have risen.
BTW, I think your former friend is being dishonest, too...to his customers and himself. I can understand the need to make a living as a woodworker but one compromise leads to another and eventually, the result is not even good, much less fine craft.