Let's not confuse the two, as it can lead to sloppy thinking and bad planning.
Let's take the case example--one familiar to me--of preparing a sailing vessel for a voyage. That sailing vessel, it is obvious, needs to be self-reliant. Even a week at sea will shake out a great number of possible problems that must be within the means of the vessel and crew to deal with without outside aid. Both Homesteads and Seasteads need to have the capacity to operate in a self-reliant manner much, if not the majority of the time. Certainly in the context of ocean sailing many of the dangers one may face are pretty transparent and obvious. With homesteading ashore, at least in the context of recent history--many of the dangers are much less well understood. There is a fixation with many with growing food--but as with Seasteading--one can quickly find out that food self-reliance is the easiest thing to achieve. It's the first step, and a critical step, and must be achieved, but there's a hell of a lot else to think about as well.
While Self-Reliance is certainly a value to be sought after--sustainability requires a community. Certainly the more self-reliant one is, the less often one will need to call on the services of the community that one cannot provide for oneself--but it is unrealistic to think that one is going to provide everything. You will need sail cloth, cordage, chain--and while it's possible to consider or fantisize about providing all of those things for yourself--it's a lot more efficent to allow someone in a community that has far more interest in weaving cloth or spinning fiber to take on that task rather than dinking away at it yourself. At the very least, someday, somewhere, you're going to get sick--and unless there's someone to bail you out, your self-reliance will come to an end.
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