You are no doubt IMHO, and with 1st hand experience, one of the exceptional craftsmen who does provide the desired results for your clients and I was more than happy to work for your customer last year.
I also acknowledge that you have the right to defend your profession as I have tilers over the last few years on this Tilers Forum and totally agree that to make a statement from 3 photos is not appropriate.
However the views of tilers on this tilers forum about the standard of work required, on the substrates provided, using the quality of materials purchased is aired in this medium as it would be down the pub and if that is about builders/plumbers/other trades then surely that's what the forum is about!
I don't however see the point of going off the OP topic to defend Builders as in this case he was paid to complete a project and he sub contracted the work which still makes him responsible, however much it cost , to have the work completed to the clients satisfaction.