Bud, you sound like a technophile geek. The kind of person who custom built his own computer. You're not the target customer. Apple builds products for people that don't care about technology, they just care about what the technology does and want it to be easy and seamless. And that is a vast majority of the people.

Let me guess, you use arch?

The first virus was made in 1986 for IBM personal computers. Nothing is free from computer viruses. Not macOS, not iOS, not Android, not GNU/Linux, not freeBSD, not even an IBM PC from the 80s. All software can be exploited. The only reason GUI software is the most exploited is because it is what people use. https://en.wikipedia.org/wiki/Brain_(computer_virus)

GUI is not only intended for office tasks. In fact, I would argue that many office tasks are better suited for command line, but I’ll agree that nobody knows how to do that anymore.

GUI was always best suited for artists. Apple has, for a long time, especially since OSX, been explicit about catering to artists. Can you imagine editing video in a terminal? Or editing a layered image? Or producing music?

While you may be correct I think you're still missing the point. CLI is for super nerds. While you and I may know how to use it, the average person doesn't, and is unlikely to put in the effort to learn. That is the innovation that Apple made in bringing computing to the mainstream. It was precisely because people didn't have to learn how to navigate the CLI environment and instead got an easy point-and-click interface that computers caught on with the public at large, and that gained Apple an absolute ton of cash money and noteriety.