Richemont basically bought Watchfinder somewhat recently to get a claim into the pre-owned watch space. Since they foresee control of the pre-owned watch market would help boost their existing brand's desirability since resale value is a big part of new watch prices.
It's basically like Tesla. Tesla controls the pre-owned car market of its cars and artificially props up the prices to keep new cars desirable. They're trying to create their own bubble, and control it. With adequate control and normal market forces, assuming a steady demand of buyers and sellers, this bubble would never pop.
I wouldn't say Richemont brands in my experience are better nor worse than others. I would say that I do not like Richemont's service center in Dallas very much, as I've seen them make multiple mistakes. But then again, Rolex's service center in Dallas, Texas also overpolishes watches. Patek Philippe has a lot of servicing problems. Generally, I now only try to buy watches from a brand where I trust the servicing will be done with integrity. Nobody's perfect. Some people swear by Singapore Airlines and Four Seasons Hotels. I always say; fly them often enough and stay with them often enough and you'll eventually encounter a big screw up. You might have just been unlucky.