Image based distros are only complicated if you come from traditional distros, because they’re different.
If you come from Windows or another OS, then having “The whole OS is one thing” instead of “A huge collection of packages and directories” makes everything simpler to understand, because you don’t mess with anything except /home/. You don’t have to care about anything else.
And if you want to do something more fancy, like using a CLI tool, then having to enter a Distrobox container isn’t complicated.
For casual use, like gaming, browsing or image editing, everything is just as usual. Nobody, except us Linux nerds, actually cares about the underlying system. Casual users just want the OS to be a tool for their programs they use, and for that, it’s ideal, because it just works and doesn’t bork itself.