Over time PD's in high amounts can dry out the plasticizers in clearcoat paint and cause it to fail. This could take years, of course, but frequent use of products with a lot of PD's is not a good thing.
As 4DSC said PD's are in almost every product to some extent so perhaps the goal should be to avoid products with very high amounts of PD. Some products use PD's to chemically clean your paint. Others use mechanical abrasives. This is most common in the one-step cleaner waxes on the market. This is one great reason to not use NuFinish. Its both very high in PD (I don't know the exact amount but my conservative guess is 50% by volume) and has mechanical abrasives. Not a good 1-2 punch.
Non cleaning carnauba waxes need PD's to act as a carrier agent so the carnauba can actually be applied to auto paint. This is an example of PD's being unavoidable. Fortunately products with lighter solvents shouldn't harm paint as the solvents typically evaporate after the wax is applied. But if you can stay away from products with heavy solvents, it would be better.