You're completely missing my point.
I'm not saying that there are no flagships that support SD cards. I'm not saying that SD cards aren't cheap. I'm not saying that other, non-phone devices don't use SD cards (this is getting waaaay off my original topic) and I'm not saying that nobody uses SD cards or that they're completely irrelevant.
My original point was that "SD card support" isn't as big of a selling feature as it used to be, partly due to the abundance of cloud storage making "SD card support" less essential (I'm NOT saying it's pointless) since there are other options out there.
I'm literally just saying that Samsung stating "We have SD support and Apple doesn't" isn't as big of a "hit" today because of increased internal storage and cloud storage options, some of which are free.
Yeah, 4 years ago when my family and I all had a 16GB iPhone 5S and no free unlimited Google Photos storage, we really wished we had SD card support. Today when you buy a flagship iPhone, you'll have at least 64GB, access to Google Photos, OneDrive, Dropbox, etc. Plus we have the added benefit of accessing these files on multiple devices nearly anywhere without swapping out a physical card.
Would SD card support still be nice? Of course it would. Is the lack of support as restricting as it was used to be? Definitely not.