That's was done by some, experimented on scale by very few and... well... it prove to be not really feasible: boats are expensive, far more than homes. All the efforts to made cheap and large-enough house-boat led to crappy stuff who do not last much. You need anyway much more raw materials and maintenance, most water is salty and salt corrode anything, lakes are too few and might make unpleasant drought issues and unpleasant waves... Insulation is an important issue, so energy consumption is. You can't even have good p.v. just because of limited AND constantly moving surface (your inverters suffer much a constantly crazy p.v. input).
You need fresh water and the cheap way to get is is from land, so you need land infra anyway, you also need food and you can't produce it locally, yes you can fish, but you do not live well ONLY on fish and some algae... Beside that logistics is a nightmare.
Long story short: FEW can live, perhaps even very well for some of them, on boats, but only if most others do not. That's an important issue too many forget even when they speak about Green New Deal: yes, we live in homes. We might WFH. BUT we also need factories, hospitals, schools, they are mandatory to live well and they need to be counted in the game: we need to sustain them as well. We need workers and they need a life as well. That's not much "housing problem" but is tied because we need a home to live BUT we also need to be physically nearby something else to do so as well. The dream of an autonomous home is not much different than the dream of an autonomous house-boat or starship or house-truck, house-airplane etc we can made "relatively autonomous" homes, tucks, ships, airplanes, ... where relatively means "you are free to live in in comfort FOR A LIMITED PERIOD OF TIME until something breaks, for instance, and such "things" can exists for you just because there is a complex industrial and social system behind. We still miss the 3D printer able to print itself...
That's the real issue... We are able to reproduce ourselves only with our body (well, if we can keep alive in nature) but we can't do the same for anything we build...
