Using flagstone coping, as standard, sounds like a local pattern. I'm pretty sure it's not an national one. But, *I'm* not sure I'd want to use salt on a pool with high evaporation surfaces, like waterfalls.

Regarding the positives you think salt has, I'd urge caution. They are commonly oversold as "eliminating pool chemicals", "chlorine free", "natural" and so forth. These are ALL bogus claims.