Any idea why those folks chose Jandy ? Do the other 2 seem to have similar wahoo installation rates ? Think they will follow suit for similar reasons ?
In my area, Jandy dominated for years. In fact, until Pac-Fab started buying American Pool Products, Purex, Rainbow, etc. and then was purchased by Pentair, and they bought Sta-Rite, they seemed to be the largest 30 years ago. I started to do warranty work as just a supplement as there is not a great deal in it for the service person.
Same thing happened with both of the other big guys. My preferred line was Hayward at the time. Never sold a lot of Pentair, just personal choice (I have a Pentair filter on my pool). Ultimately, they've all been very good equipment, in my experience
If I installed a piece of Hayward equipment and had an issue with a warranty part (which didn't happen much, same as Jandy) I could just call them, tell them the issue, they would either send the part to me or the customer. I was happy to make the customer happy by doing the repair (actually never charged the service fee that Hayward suggested), and then return the bad part through distribution (wholesalers). Local rep would pick it up, done.
With the advancement of internet sales, Hayward was receiving so many "warranty" claims that were related to improper, non-code, etc. installations that now all warranty issues have to be handled through their warranty stations, with a fee, even if a pro does the install. I can't even help a customer now except recommend a good warranty person I know.
This is one reason that you can't purchase some brands online (yes, there are ways around that), or the warranty is limited if self-installed. Manufacturers, by laws that vary in this country, have to offer some warranty on their parts, but also have to protect themselves.