Comeone Markus! At least give the users some credit. They´re not all that stupid. There is a specific reason why they´re even suppose to be reading the doc about an computer based Smart Home System. They have an interest even before they start to read the doc. Othweise they would never have come this far.
Lots of people are used to add USB devices and/or external storage to their workstation. Adding a SSD/external storage to Rpi is no different. Infact I would say, users beeing more used to USB/external storage devices rather than SD cards.
Second - It´s the exact same procedure the user will be doing, when copyíng the image to an SD card or an SSD. So no need to add extra explanation in how to.
The benefits are huge!
(The Rpi 3B+ will boot from external storage devices by default. Rpi 3B and older wont).
My question was a suggestion, a tip section for optimizing specially for the Rpi. It´s not something I´m going to argue about.