Yes, you were told in person, and on the phone that it wasn't a very good job. I demanded you redo the stairs, because it was embarrassing. But that is not even relevant.If you cannot use masking tape, or see dark paint on white walls, or see objects over 1" long, then you aren't very good at your job.
The cracks still being visible is just you giving me bad advice for big $$$. That was the purpose of the job, and the method you endorsed was the most expensive method, and 100% ineffective. I fell victim to salesmanship.
Think of this as a product review. Nobody would find dark flooring epoxy on the walls as being acceptable. You shouldn't have either. If I came to your house and splattered the walls with paint, would you say that's good?
Workmanship - F, splatters on walls, large debris trapped in coating.
Color - D, silver highlight cover wipes off, 8x8' purple area in grey color.
Coating - D, 1" dia hole left in upstairs floor, plywood grain and nails still visible upstairs, did not even hide hairline cracks.
The fact you could not tell these were defects, indicates that I'd be foolish to let you work on it any further, especially after a failed repair attempt.