And fortresses are also very expensive. Nobles pay good money to buy them. And doesn't it say something about you 'signing the last block' when you make fortifications? If it is in blocks, it is highly likely stone.
Propaganda is words. But, unless he is hallucinating, sights can only be changed to a degree, even if you are looking at them with biased eyes.
Fortresses are very expensive... because they are huge not because of there construction material making an entire fortress out of stone in a forrest is illogical and even more expensive than building a fortress would normally be because not only do you have to transport the stone, you have to transport the stone through a forrest. Signing the last block is flavour text and has about as much value as the "hack the router" option for infiltrators.
