If you look at the introduction to Raspberry Pi OS they show how to use the GUI software installer, as well as the command line. None of this is secret and Linux (and other OS) had package management a very long time before Apple or Windows products. I feel that people are just more familiar with Windows having spent so long using it. The raspberry Pi people are pretty clear in their documentation, since it's primarily aimed at children and those teaching them. Observationally I rarely see anyone look in the Windows documentation, mostly they just do a web search if they want to find out how to do something. The people who look up the Microsoft docs are the same as those who'd look up the Solaris/Linux/GCC, whatever docs. Just using Linux as an OS is perhaps the sanest way to get to grips with it.

Just using Linux as an OS is perhaps the sanest way to get to grips with it

I think you are spot on...
For too long I've shied away from Linux but this Raspberry Pi project has forced me to face it head on with a lot of help from the Monastery and from the Great God Google. There is no mystery - just a steep learning curve and I am slowly piecing together the knowledge of the tools that make that ascent manageable.

when one doesn't know the command exists it is not there to be discovered.

man apropos

Thank you hippo, that's a big piece of the puzzle put in place 😊
Not the most memorable name but I won't let that get in the way...