In the TH-57 series (BH-206B) there was force trim, but there was also some cyclic friction applied. Most of the time pilots didn't adjust it. I assume the reason is that there's probably some happy approximate level of cyclic friction that most pilots of that machine like.
Once in a while a machine would come out of maintenance and there wouldn't be any friction on... that wouldn't last too long as a student would have a very hard time managing the machine, especially during low work.
Sometimes instructors would (while instructing hovering) place a dampening hand atop the cyclic to reduce the student's PIOs. Not friction, per se, but tends to help the student to figure out appropriate input levels.