In my experience, most greybeards on this forum will be able to recall that command from memory. It's part of the reason why HN is the place to be, these days.
Sheeeeeit, I had grey in my beard before the Windows store even _existed_.
These days, if you're serious about tech in itself, and not just its money-making potential, you're bound to get stress-induced grey hair and beard very fast...
Every time I tried to learn poweshell I am always put off by the capitalization and verbosity of commands. Not sure if I'd be feeling this way had I used poweshell first before being exposed to bash and windows cmd.
It's case-insensitive, so the capitalization is just to make it easier on the reader. Add mentioned there's enough auto-complete that you don't really have to care.
It's verbose, sure, but it has great autocomplete support to go along with it.
I think once you understand what the individual bits do, it's easy to memorize them, then reconstruct the command from what you've memorized. The only part specific to the Store app is "WindowsStore", the rest can be used for installing any app.