On 2022-01-10 20:59, Greg 'groggy' Lehey wrote (in part):
As long as man pages are formatted with ?roff, I
don't see it going
away. I don't suppose many people use troff any more, but there are
enough of us, and as long as man pages stay the way they are, I don't
think we're in any danger.
Macos ships with *roff.
N.