Why would you build something designed to be in close proximity with lava out of something that isn't resistant to it?
SA- theres a boat load of impossible crap that happens throughout SW from Luke dropping several stories from the AT AT without a scratch to the lack of wind in cloud city (not to mention several other impossible to so incredibly implausible theres nothing else to do but call it a scriptwriting shortcut). Which people accept because its throwaway fantasy.
Whats annoying is when critics etc. pick out apparant flaws of the PT which have actually existed all along.
I'd never try to find an excuse like your other half did but at the same time you'll never see me coming up with excuses for the crap in 4,5 and 6 either.
the concepts in the OT were all old concepts...if you've read through old sci-fi comics of the 50s and 60s alot of this stuff already had been conceptualized and justified in a sci-fi sort of way.
cloud city works because of hover-tech and the atmospherically shifted altitude conditions of Vespin.
if those are the conditions of Vespins stratosphere then is surface would be increadibly dense and uninhabitable. So if Vespin has open settlements than cloud city is bogus.
surfing the waves of a lava planet is beyond conceptual salvageability, little more than if they were fighting swiming in it. A river that runs through a planet core could only happen in a planet colder than hoth and even then it just wouldn't...
the OT stuff stretches the imagination and bends the rules, the PT stuff tears the imagination and snaps the rules. There's a very clear difference between the fantastatical elements of the OT and the plain absurd ones of the PT. ...and it's not bias based on hatered for the PT its the basis.