Yeah, "phoneticity" is a new word for me, but I'm assuming you mean retaining the (sometimes bizarre) original spelling of loan words so that it's clearer where

Yeah, "phoneticity" is a new word for me, but I'm assuming you mean retaining the (sometimes bizarre) original spelling of loan words so that it's clearer where they came from. In a language like Polish where rules are rules, I think you will be able to see fewer shifts in texts. I think where you would notice a real difference is if you could get a recording of a Polish speaker from 1545. (That is, if you could somehow get a recording from 1545 without somehow also making it available to most of the people since 1545. It's going to be interesting to see 1000 years from now how the availability of recorded media at scale is going to change the basis of new language evolution.)