I don't wear the Pfanners (StrechAir)if it is over 30C. I can count those days on one hand and still have fingers left over. Other than that, they are on.
In Texas, and the southern US, there are 4 seasons. No real winter so to help the rest of you northerners and Euros understand, the seasons are basically: Fall, Spring, Summer, and 7th Circle of Hell.
Before Germany, I was working in Austin, TX. The same paralell as southern Morocco. Now I live in souther Germany, same paralell as the US/Canadian border. Some places are just too hot for year round pants, chaps.
I do think they should be worn when it is safe and possible to do so.
I see a lot of the Euro crowd with these insurance concerns that if they get hurt, insurance won't pay because of some safety infraction, etc. These are the same people I see using a chainsaw with pants, but with hikers instead of the required chainsaw boots. If an insurance company isn't required to pay because of an infraction, you can be assured that they will find one.
I think steel straps and chainsaw protection have an important place but can give people a false sense of security.