So many people here are missing the point of how a scout can do great against a rogue IN THE RIGHT GEAR. If you claim shadow prison = dead scout than you obviously need to up your game/gear. A scout can get more pdef than a mage, and many mages I know, including myself, have no problem surviving a Shadow prison assult. Honestly everyone here is comparing using their own experiences which will all be different according to who you fight, and the rank of guilds you are up against. Scout IS viable PvP, and PvE. R/s R/m R/k R/wd Doesn't matter, there are many more variables that determine the outcome of fights then simply oh its a scout vs a rogue...
Don't you have a pocket healer with you at all times?

Anyway, I can't speak for others but my view is this, what can a scout do to counter unlimited hide and shadow prison? Sure, with full honor gear you can survive one attack, but what if a rogue shadow prisons you, shadowstab bleeds you, combo throws, then vanishes. How much hp will you have when the rogue does it again and again? It would be like a jaguar stalking a capybara IMO.
This is all theory, of course, since there hasn't been any real scouts in siege for probably at least 2 years. It would be a great experiment if we could have 2 OP players, scout and rogue, volunteer to test this out. Each join their alt guilds and declare siege against each other several times to see what happens. Stay on one side of the map ofc to make sure they have some chance of encountering each other. Then we could see how the theory tests out in real life. Ofc this is all meaningless for normal sieges with healers.