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> 2) ISO 8601 is prolific. Is RFC 3339 well used/adopted in any system?

ISO 8601 was first published in 1988. RFC 3339, while ostensibly dated July 2002, codifies practices that date back to Usenet and e-mail (RFC 822: August 1982), and perhaps to the date utility (which existed in Version 1 AT&T UNIX).

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Nah, email and classic Unix use entirely unrelated date formats. The RFC 822 format looks like "Thu, 31 Aug 2023 20:53:11". Unix / ctime(3) uses "Thu Aug 31 20:56:52 2023".

RFC 822 is what RSS feeds use and RFC 3339 is what Atom feeds use.

I don't know about you, but I think RFC 3339 dates are much more appealing :)

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