Agreed. I suggest further reading in the forum. With all respect, you are not by any means bringing up a new point. You’ll find two major philosophies:
On the one hand, are fantastical multi-million dollar “real estate development” schemes modeled after high end resorts, super-dense urban business districts, etc. Much hand-waving is done to sweep the “irrelevant” details of inputs and outputs (food, fuel, waste) behind a curtain (“nothing to see here” philosophy.) There are a couple of real life implementations which make people think this is feasible- like the Palm Islands in Dubai.
However, none of the real life solutions are actually seasteads. They mostly don’t float, (with the exception of The World, and we are often told that taking up permanent residence aboard a traditional vessel doesn’t “really count” as seasteading by the folks in this mega-complex philosophical camp) none of them are designed to be mobile (in terms of geographical arbitrage and jurisdictional choice), they have ZERO amount of political autonomy, they are owned by nation states or multinational conglomerates, do not have any permanent residents with a political or ownership stake in the administration of the platform, and are out of reach for common income levels.
This means (IMO) they are NOT a gateway to ocean colonization on any kind of mass scale. They are essentially tourist curiosities. Notice that career opportunities aboard “The World” do not include an offer to become a resident, and are described as “beyond the expectations of even the highest luxury hospitality standard” and even the bartender requires “Minimum of 3 years experience as a Bartender on an ultra luxury cruise ship, private club, boutique hotel, ultra luxury hotel or resort.” The Residents can’t be bothered by socializing with the underclass, apparently.
On the other hand, there are those of us who take the “homestead” root of seasteading seriously, and look at developing farm-scale to village-scale options for individual families and persons permanently living on the ocean, with all the details of living on the ocean full time, like jobs, wastewater systems, food production, and the myriad services expected to keep people healthy and happy, including a stakeholder role in their own political and administrative needs.