Along_the_Wire Being able to turn it off allows you to ‘recreate the vinyl experience’ or something like that at a guess. Also, if you pitch it up to +16, some of your hardcore djs might be into the pitched up sound. Suppose some tracks might also happen to only work in key once the bpms have been matched and the key lock would then give you a key clash?
But yeah, keep it on, pick tracks that don’t key clash in the first place.