Gentoo probably doesn’t have all packages. One of the reasons I love Arch is because it almost always has any package in the AUR. It’s a lot more work to try and get something installed on Ubuntu related distros. They try to keep up by using snaps and stuff but it’s still no comparison. Arch has everything.
Still it’s gets a bit boring now since I know it so well, so want to try Gentoo at some point also.