I don’t go blind on these docu’s. But in this case i checked for articles/papers/journals about above 3 subjects and they are all valid. I don’t have links handy anymore, else i would add them. Anyhow, it all points to very early water on Earth, right after Earth formed, the Moon formed, and the Late Heavy Bombardemend. Thats why i think that Earth could not have been cooled down too much, not enough time….so heat could be right under the surface instead of the current depts. If anyone eats docu’s, its fun and not preudo-science as alot of them are; https://www.youtube.com/watch?v=ys5hmBkyvag

Another aspect, which I’m sure has been at least considered (though I don’t recall reading about it): there was a lot more radioactivity in the Earth’s early days. Not only was there a lot more U (and somewhat more Th and K40), but there were likely appreciable amounts of radioactive isotopes which we can no longer detect (e.g. Pu). Too, it may have been that the distribution of radioactives was different, with more closer to the surface, relatively speaking, than today.

To K.J.’s point: if crustal plates moved around back then even somewhat similarly to how they do today, there’d be plenty of hotspots, where we find black smokers today. Whether these were underwater or not, the immediate environments would have been nice refugia, if not even where Earthly life began. However, I doubt that these would have been able to sustain much more than giant lakes of liquid water, much less planet-spanning oceans. But maybe plate tectonics was quite different, back then?