Robin Hanson—the guy that came up with the grabby aliens hypothesis that seems to have solidified itself within the EA-rat zeitgeist—also has some very interesting and fun ideas on what UAPs might be—some that actually answer some of your questions:
https://www.overcomingbias.com/p/ufos-what-the-hellhtml
https://www.overcomingbias.com/p/ufos-what-the-further-hell
I’m surprised I don’t see his blog cited anywhere by you or mentioned anywhere in the comments.
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Robin Hanson—the guy that came up with the grabby aliens hypothesis that seems to have solidified itself within the EA-rat zeitgeist—also has some very interesting and fun ideas on what UAPs might be—some that actually answer some of your questions:
https://www.overcomingbias.com/p/ufos-what-the-hellhtml
https://www.overcomingbias.com/p/ufos-what-the-further-hell
I’m surprised I don’t see his blog cited anywhere by you or mentioned anywhere in the comments.