I have been reading just about as much as I can about pool building, maintenance, problems, solutions etc. since about April, and a couple things I have seen to be just about universally true.
Florida builders love very small filters
Texas builders hate salt water
Maybe that's a bit of an exaggeration, but from what I have been able to piece together, not ALL builders hate salt water, but the ones who are adamantly against it, just do not understand it. And if they do not understand it, and are so dead set against it that you have to sign a waiver, I'd be worried there are other things the builder does that may be an older way of doing things, and just doesn't keep up with the times. Do you mean to tell me that Pentair, Hayward, and Jandy, the three largest pool equipment manufacturers are making equipment for salt water pools that are going to destroy your investment?!?! Come on, that's just not true. These companies have been innovative with new solutions for your pool, and make equipment for everyone. Not everyone wants a salt water pool, not problem, we have equipment for you too. But for a builder to make such crazy statements would give me pause for sure in going with them.
I tend to believe that the builders who are just so angry about salt, are not willing to make changes with the times, and are very comfortable with the pool and equipment they know and trust, and have been doing it the same way for years and years. This is their tried and true workhorse, they will sell a ton of them, any outliers will be shot on site. They may build a very nice pool, with very capable equipment, but that doesn't mean that is the builder for you, because your wants and needs just doesn't align with theirs.
My builder in particular does not prefer to install salt systems. But that is not to say he didn't, or wouldn't, he just prefers his tried and true system. He also wanted to install an Easy Touch 8 system vs. the Intellicenter I wanted. Again, his tried and true workhorse. In the end, we worked through the discussion, and got my salt water pool and Intellicenter. If he was even a little hesitant to work with me on my needs, we would have went with a different builder.