Ubuntu actually bakes it into the kernel for you. I prefer having it in the kernel after having to deal with failed kernel upgrades several times in a row.
In all fairness, they read out the part of the textbook that went over it. This was also the same paragraph that explained they can be used as well as the difference between you singular and the royal you.
That being said I'm sure we were both sarcastic in our prior responses but I'm attempting to show that I'm not pulling this out of my ass and I'm relying on a source of truth.
Unless I'm missing something, Gentoo uses out of tree kernel modules. https://wiki.gentoo.org/wiki/ZFS#Installation
Ubuntu actually bakes it into the kernel for you. I prefer having it in the kernel after having to deal with failed kernel upgrades several times in a row.