If you do have an unplanned accident, any impact protection you can get helps.
Riding pants have impact protection, jeans do not. Also with jeans as thin as they are you can rip off skin even under them. The riding pants generally protect you much better.
As for heat in the summer, yep, hot, but some do have vents or vented panels if that even helps on the Wing, I suppose it does a little bit, but sitting behind that fairing venting is relative to imagination.
My gear is fine as long as I am moving, slow traffic.....yep it can get hot.