Most of humanity lives near coasts and rivers. The idea of these houses is that they're flooding resistant: they just move up and down with changing water level

Most of humanity lives near coasts and rivers. The idea of these houses is that they're flooding resistant: they just move up and down with changing water levels. They're well anchored, but indeed utility connection are a weak spot, perhaps modulated by having solar panels. In either case, they obviate the need for precise and expensive regional water table control, for which the Netherlands is famous. That kind of control isn't a feasible solution for many countries, whereas floating houses would be. I'm not sure these houses are the answer though, but perhaps they'll come with some other answers to questions related to living in this way.