I think it is worth making very clear that a valley in this section, is very different to the kind of valley Stardust and HRRR used to experience, we are not talking about a gravity section. We are talking about LSMs powering a very heavy train full of people over a airtime hill that appears to be about 7 metres high hill, then up a 50 metre spike. It might seem crazy that Hagrid's fails on the spike, but seemingly it does. LSMs fail to energise correctly, yes rollbacks my be quite rare but certainly less rare than gravity/air&wheel friction events, but clearly they felt the need to remove the need to call the fire brigade if it does happen, and make maintenance much easier too.
They are not spending big money asking Intamin to fabricate a bespoke canopy when the existance of a catwalk, alone, speeds up evac signifcantly. If this shade idea was even a real problem that needed solve there are cheaper ways than asking Intamin to incorporate it into their ride.