The CLI is not faster for everyone. Especially non IT users who don't know any of the options and would have to search the web every time. And there are so many commands the CLI is useless at. Graphics and presentations a big fail. And few people use CLI for email or spreadsheets.
GUI users have a chance to work out how to use a new GUI 99% of the time, as it is all familiar. No exact syntax to type perfectly or it will fail. On other occasions, web help tells you where an option or command is. There is no need to entirety change the way you work, just for a few times when learning new software.
I use the Plasma app store Discover to update, upgrade, install and uninstall apps. Everything is easy. Even unpacking files and permissions are easy in the file manager. No need for CLI as I'm a home PC user.