Yep.
Very handy in a pinch.
Regarding package management on a Kindle -- there is only so much you can do on an embedded device where you don't control the pre-existing environment. Even Windows has Chocolatey, and linux has LFS where you "./configure; make; make install" everything without aid of a package manager.
Theoretically we could write our own package manager or adapt another overly-featured one.
But most people using JBed Kindles are using Windows anyway, and wouldn't even appreciate it.
You can of course install a debian/archlinux chroot and do stuff there.
