Then again Ayvah one of the biggest reasons for even bothering with the funding is for them to take the risk to make a good DM mode.
It is a weird thing whenever I bump into the opinion that the stretch goals should "not interfere with the development" because it goes against the idea of stretch goals altogether... Which is putting the game into more development so that the final product is even better.
If people don't want a delayed game they shouldn't endorse stretch goals at all.