Because a GUI conveys meaning, because humans are intrinsically better at memorizing shapes and location than some random abstract characters that do not mean anything to then unless you use them all the time. Because a System Settings panel with submenus and descriptions on their checkboxes and sliders is the manual AND the option simultaneously, small "?" with hover-over information boxes make it optimal. A GUI can go so far to turn completely red to signal dangerous settings, the CLI will happily oblige in whatever stupid command you enter. Hell, even god damn APT had NO option to warn users that they're about to uninstall core system components until a big Youtuber like LTT had his distro blow up in his face. And STILL there were those people who tirelessly argued against a god damn warning… and colored text.
GUI is by design better at guardrailing, meanwhile in the CLI a single wrong command with sudo in front can destroy your entire OS.
I can't fathom how this isn't painfully obvious to anyone who thinks about this for even a moment…
We got to approach this nuanced though. Yes, a strong stance against all the enshittification (incl. dark patterns and all that) is absolutely necessary to preserve the good things most Linux distros have in common. For example once KDE e.V. and the Gnome Foundation have finished their work at the payment backend for Flatpak repos we absolutely need to bolster Flathub + a handful of others (to avoid centralization) so they become a default, and through that are able to enforce a strong "no bullshit" moderation as companies are trying to "capture the market". This will be an inevitable shitshow as Linux-based OS' become more popular.
Meanwhile we have to admit that not providing comprehensible and well integrated GUIs for everything - and that includes stuff like Bootloader settings, Systemd Services Management, sysctl configuration etc. - is a shortcoming that should be remedied in the future. On rare occasions even average users will have to open these things, and it's way better if they do so through an environment they can understand and navigate. Anything else is just gatekeeping.
Linux should be accessible to everyone - that includes normies as well as those who may not be mentally able to understand or memorize CLI. This fear of enshittification is understandable in our current landscape, but it absolutely doesn't help if it stifles development towards more user-friendliness. After all nobody argues to take away the CLI in any capacity, just to add another abstraction layer for those who either need or want it. Which, assumably, are most people.