Surprising you haven't come across a man page that basically says "We couldn't be bothered putting everything in here, check out the info page on it instead."
I feel like I find myself on one of those every 6 months or so.
That's funny, I had the opposite experience. When I found out that info was the GNU projects recommended way of documentation, I was all on board. Then I tried using it, and it couldn't find most CLI software I used. So I downloaded the texinfo archives... and that still lacked probably 50% of the commands I tried to look up.
Then I searched up how to get info pages for this or that tool, and someone on StackOverflow had said that it was woefully incomplete and outdated at this point.