> Debian, the so-called "universal operating system" just dropped 32-bit x86 support.

I would argue that Debian has support for at least as many architectures as Gentoo:

> https://buildd.debian.org/status/package.php?p=base-files&su...

I know that because I am maintaining most of the obscure architectures in Debian with regular installation snapshots:

> https://cdimage.debian.org/cdimage/ports/snapshots/

Debian even has a Hurd port for both i386 and amd64.