The black spooky ghost lantern I bought years ago for Halloween has long since become an all-year-decoration, because, why not?
So let's generalize your premise a little:
August is a month, as is October.
Reason enough, I would say!
I don't even have a counter argument for your logic.
Are people really just omitting full words in favor of 1 letter now..
Y
"w/" has been around forever, though it's a bit less common without the slash. Here's a random language forum post from 16 years ago commenting on how it's common which I found with a quick search, I'm far too lazy to put in more effort but I'm sure someone properly motivated could find older references or maybe even the full etymology.
Local convenience stores have rolled out the pumpkin spice coffee. It is time.
