I don't think its an inherent quality - a lot of older models had a much more natural feel to them.

I guess it has to do with the low temperature (low randomness in final word choce - something all vendors seem to have converged on for some reason) which does make them less likely to skiz out but makes the writing feel dry and samey. It's like repeating a list of dice rolls, and replaying them - there's no inherent pattern in the input, but there sure is in the output.