Whilst I do agree that making a canal that will take a couple of decades to finish is a dumb idea, when the final product is up, the goods will outweight the bads.
TheSovereignGrave said
Not when it takes decades and large amounts if money and resources to build. There's a reason you didn't have a bunch of canals being built in Medieval and Renaissance Europe.
I would have to disagree, but that's just my own opinion.