To be fair if you want to learn your options (without properly informing yourself using a manual) tab complete can be useful if implemented.
Also most programs come with their manuals so I'd barely call it external. The manuals are also usually better than what I've come to expect from the text to go with buttons in a GUI.
Knowing what commands are required is always going to be necessary but there's also not that many worth remembering.
I would assume that prime minister would be more common in Britain. But even if it is also something with the menstrual cycle what would be wrong with that? It's just something some people have.
When trying to check the first result I got was actually the plus-minus sign (\pm in LaTeX) which is also cool.
HP had a thing that popped up in my task bar that in order to hide I had open their preinstalled software that didn't work.
Also less common were the Microsoft account things after updates and other Microsoft fullscreen things that caused serious difficulties as they wouldn't even render right in some cases (I got something telling me to install windows 11 which wasn't even possible for some reason and the close button was off screen, that happened the last time I used that computer after not having touched it for a couple of weeks).
Edit: Things I couldn't do but can do now that I use Linux and learned how to:
bind my own system key combinations
select the right (GPU) driver version (though the newest has been fine for months now)
use a launcher that doesn't open bing in ms edge when I spell something wrong and just generally is quicker.
I haven't personally encountered any of that myself. I personally don't use GUIs (UI could also refer to a terminal) for anything other than apps that implemented one for their own settings and unless they use the same terminology as the terminal commands or files I wouldn't be able to guide anybody through one. So if people are just unwilling to learn how to use a inferior yet simpler way to do something just because somebody who asked for help finds it simpler that seems totally reasonable.
My gosh if it was easier I would have done so much with Windows before switching to Linux. Instead I was stuck with bad performance and annoying pop ups from my device manufacturer.
Ahh I hate that windows does that. It makes it impossible to do anything else with the super key.
Super+D is what I use but anything but just tap that button and flash your screen with a menu you didn't want is great.