Gentoo, being a source-based linux distribution, has a very particular installation process. One has to make many decisions at every step along the way, since installation and configuration effectively happen at the same time, and certain things can be very hard to change once the installation has completed. The prime example of this hard-to-change-after-the-fact situation is the choice of file system on which the OS is being installed. Whilst there are a variety of filesystems available for use under linux, in my opinion ZFS remains the best one available, at least until BtrFS matures and becomes stable enough for use in a production environment.

The Gentoo article on the topic of installing on ZFS is very good, but out of date in that it does not cover the extra steps required when installing on an NVMe SSD. My life was saved by a blogger named Guy Robot, whose excellent article I followed to achieve success. Thanks Guy!