I personally dont mind riding in the rain if i dont have to be somewhere dry. You dont get too wet on the busa if you tuck well. My shoulders only got wet in the pouring rain
I can't believe you rode like that on slippery roads.
You would never, ever catch me riding without complete gear even on a hot sunny day. If it's too hot for a complete gear, I would just stay home. That's just me. To each his own, I guess.