This is super interesting, but why were we building concrete boats and are not doing it anymore? Was it more or less just a experiment?
In the end, there’s no reason why you can’t. There’s plenty of reason why you shouldn’t. Costs being the biggest. Fiberglass builds are just so much cheaper than anything before it.
https://en.wikipedia.org/wiki/Concrete_canoe (also a thing in europe)
But not as commercial products. Because concrete is just not the best ship building material, you only use it if you either want the challenge (as a student) or you simply don't have anything better at hand.