That would be true if the GUI worked correctly.
However, more often than not, some inner thing breaks, which means that the GUI just throws an error screen and tells you "good luck". So you have to search for that text in Google, and it will send you to an obscure forum where a guy said in 2014 that the solution for that problem is to run some random command in the terminal.
For example the "app store" GUI for Kubuntu never worked for me. It always stalls at some point or another. Meanwhile, running sudo apt upgrade worked flawlessly. Both operations should be doing the exact same thing under the hood.
Two times already, a relative that uses Manjaro but has no idea about Linux came to me for help because the "app store GUI" (which is a different one than in KDE) one day stopped working. The issue was to run some random key-relayed command.
Years later, I found out that apparently the Manjaro maintainers let their certificates expire MORE THAN ONCE. Which has to be fixed manually by the end user apparently. And they apparently didn't think of adding a notification in the GUI telling you about this. Which is bonkers. Not everyone reads all the news articles relating to their OS.