Not only the change in script. Written Ottoman Turkish was a different language than Turkish, basically. It was so replete with Persian vocabulary and grammatic

Not only the change in script. Written Ottoman Turkish was a different language than Turkish, basically. It was so replete with Persian vocabulary and grammatical constructions that the average Turk wouldn't be able to make sense of it even if they could read the script. Also, Ataturk's language reform led to the forced replacement of many 19th-century Turkish words with neologisms, to the point where the old words have been utterly forgotten.