Sometimes extreme examples are useful to illustrate a tendency, or just a make a point. Like jewelry could be passed within a family from one generation to another in case it was needed to buy personal freedom or life, but hoping never that to be the case, enjoyed in the meantime, or used for ambition rather than desperation.
As was saying in the opening post, sailboats might make sense for a single-time escape like Orlov proposes, but they have many shortcomings, like maintenance and laborious building, which would in time emulate the same sorry situation as the Easter Islanders’ having exhausted and lost (chicken-egg) both the raw materials and kniow how to make trans-oceanic Polynesian rafts.
A floating base of some kind would provide a solution for those shortcomings and a way to continue life and thrive during peaceful and interesting times.
The simplest design that comes to mind is the ocean sphere you proposed combined with some docking element. O----
Another design could be just a dock, which we call the ramform island.
a combination of the two, and the repetition of those clusters, could create an ocean support network.