While it likely has done no harm, it will impact the overall water balance chemistry. Salts act as buffers and you should already be buffered, thus you will end up with slighly salty water - if you like that go for it, but I would never add a chemical that I really don't need.

There are millions of people that claim things do things that they really don't - that does not make them right.

I would be interested in seeing some technical documentation (not just opinions) that adding NaCl to a chlorine sanitized pool has value. Please let me know of a link where I can see that.

Thanks