@bucksboy. Yep, thats why aircraft lubricants are way more expensive than your cars/bike stuff. It cant freeze easily. As for control surface clearance, all carefully caluclated because it is an issue the designers cover before glass/carbon fiber is laid. Also something checked in annual airworthiness inspections.
As for rough, thermals can be bumpy, but nothing touches the rotor associated with wave for violence. Plus/negative 5 G sometimes appears on the G meter in one aircraft I fly. and not going fast either. Getting into the laminar flow of wave is a relief. OTOH, thermalling into wave is not rough, but an interesting challenge. Only did it for the first time this year.
Wind shear at altitude can also create some discomfort. Something like an invisible truck hitting your tail as you have uncommanded lurches. All part of the challenge to fly smoothly with minimal stress to airframe and pilot.