Leon puts his hand in freezing liquid without a problem.
Pris puts her hand in boiling water without a problem.
I always thought those were more to show that the replicants had more control over their human++ bodies, being able to bypass feeling pain, or inflict it on themselves voluntarily, like Roy Batty did with the nail.
It would be interesting to see a Blade Runner 2 with Sean Young. What I don't want to see is yet another long overdue sequel where they have kept the male characters but replaced the female characters with younger eye candy. For some reason, women aging appears to be a taboo in Hollywood, and one I thinks needs to die.