I don't see what the problem is? There are tons of dark blobs around the entire railroad. It's not like I'm depriving them from being able to complete the bounty.

Graal is a game based off of Zelda, which values progression. Yeah Graal is pretty dumbed down compared to Zelda but it's nice to give some purpose to items. I loved seeing an area that I can't access and just waiting until I finally get the item that will give me access to a new area. There is very little purpose for the draisine to the average player, so this gives them adds some value to an otherwise mostly useless item.