Actually, moving buildings was a really big change. You could set up places you couldnt anymore because there was no metal nearby, and could actually have a purpose on offense.
Was this nerf a bit heavy handed? Yeah, probably.
Was it needed? Debatable.
Is it effective? Yes.
Does it define the class role better? Yes.
Valve are putting demo back into the place they originally meant him to have. Stickys were meant to be placed for defense, not used for offense. Yeah, they should have done this sooner, like way sooner. They picked a bad time too. But how long have people been whining for an update? (And for reference, they DO do this to dota 2 as well. Servers go down for patches, meta changes in the middle of tournaments, ect. )
It wasn't the best change they could have made, but I see the logic, and I like the logic.