apt-get install libflac7 libflac8
If you look in Fedora 40 for example, you'll find nodejs, nodejs18, and nodejs22. Gentoo's ebuilds (packages) can often have multiple major versions installed simultaneously. If I really need something, I can unpack another Gentoo userland, or use a container.AppImages, do exist. What seems to be the missing "glue" is putting a ui in front of users to choose what software they want to run. That problem has not yet been solved gracefully.
The author says he knows how to use Linux, but observably never graduated to be a particularly advanced user.