I'm not a fan of leg warmers, and would rather wear tights. I haven't found a pair of leg warmers yet that will stay up where they're supposed to while just walking around in normal shorts, without being ridiculously tight around the thigh. They always end up just sliding down and bunching up like an 80's aerobics video.

This is obviously solved by wearing them under bib shorts, but if I'm doing that I could just wear tights.
Unless it's too warm for tights, in which case I could just not wear leg warmers.

So, yeah. Leg warmers have a very small niche, in the "going for a super long ride where it will be 35 degrees when you start and 70 when you end" area.