I am with you. I feel color sealing is a poor mans way of covering up what they can't or don't know how to remove. Recently did a large job and all the color seal came right off and the dirt they painted over did to. Client had her tile cleaned in November and it was getting worse and worse each time she mopped. She couldn't figure out what was going on and when I told her it was mopping off there "paint" she didn't believe me. Her jaw hit the floor when I fired up and hit it with Grout Master, 1800psi and 280 degrees. Only place color seal didn't come off easy is along the edges where grout must have been clean in the first place and sealer bonded better. She now thinks I am a hero. I informed her it was just that the previous cleaner set the bar so low. She paid almost 1k for the hack job. I only charged her $450 to throw on my cape and save the day.
I’m a proponent of color seal if it’s a quality product and most if all of prep done correctly. Take painting a car for instance. If you take a car and have it painted and the paint comes off. Is it not the paint and the person & prep?