It's a great distro but suffered from a slow and difficult on-boarding process and the docs seemed often out of date with the actual distro, sometimes years so.
I'd used Gentoo for a long time but struggled with Funtoo to get everything working.
Then, some time more than 10 years ago, perhaps around 2010 or 2011, the Gentoo package system began to have some annoying problems and I have discovered Funtoo at the same time. At that time Funtoo was clearly better, so I have switched to it.
I have used Funtoo for about a decade on a large variety of computers with great success. Then, a few years ago, the package system began to have maintenance problems, like packages that were not updated for long periods, becoming obsolete.
At that time I have switched back to Gentoo, which I am still using.
Due to their great similarity, switching between Gentoo and Funtoo is very easy. Therefore anyone who still uses Funtoo can easily go back to Gentoo with minimal effort.
In any case, I am extremely grateful to Daniel Robbins, the creator of Gentoo and Funtoo, for his work. Like also the work of other great contributors to open-source software, it has saved many years of my life that would have been required to duplicate the results of such work.