Perhaps, but the aforementioned screenshot shortcut I learned just like OP because I wanted to take a screenshot, and it's muscle memory for me as well. I even thought to myself before I clicked on the article "I'm pretty sure they are going to have CMD + Shift + 4 or CMD + Shift + 5 as the focal point of the article". I would call it "inaccessible" in terms of natural discovery, sure. But it is definitely not "inaccessible" in terms of ease of use and memory when you do know about it. I had to google "how to screenshot on mac" once in my life and I've used the keyboard shortcuts on a near daily basis for more than half a decade.