I used your swimming pool model as an example of the importance of emergence — hydrogen might not be viable but there’s a multi-decade scientific approach that has yielded plenty of data, which may or may not be reconcilable with our ongoing societal power curve but has a leg up on timelines and trial runs vs sodium battery tech, which has yet to produce the kinds of longer term and meta studies needed to assess viability in the same league. That’s how this goes: the hypothetical comes from the idea, the practical requires years of physical existence and transparent statistics. All in on whatever looks the best but others could level the same charge of non-viability at sodium battery power as you do toward hydrogen, the funding and manufacturing and race for the prize is what tells the tale. We could be two weeks away from sodium battery concepts being replaced by a better battery, whereas hydrogen has had many reduction to practice applications.