Thanks for asking.
Please note that X Theme offers 2 variant of demo contents, Standard and Expanded. Ethos 3 falls under Standard demo family. Primary difference between standard and extended demo is that when you import standard demo it will setup the structural layout of the homepage that includes placeholder content along with relevant customizer settings, you won't get inner pages like about or team page.
On the other hand upon importing expended demo content it will not only setup your homepage and Customizer settings for you, but it will also import all images used in the demo itself, all pages, posts, widget areas, menus, et cetera. In a nutshell, you will receive a completely finished site design, creatives and all with the click of a mouse. You can take a look at standard and expanded demo at: https://theme.co/x/demos/
You can learn more in following article:
Thanks for understanding.