There's also the hypothesis of angular diameter turnaround: that at a sufficient distance, more distant objects would appear larger rather than smaller, because they subsumed a larger fraction of the universe at the time.

This has not been observed by JWST so far as I'm aware.

Memorialised in an xkcd comic, of course (Explain version linked here): <https://www.explainxkcd.com/wiki/index.php/2622:_Angular_Dia...>

See also: <https://threadreaderapp.com/thread/1516548836709343238.html>