We're talking about PROFESSIONAL CAMERAS used in conjunction with the MacBook Pro for professional requirements. That was the topic of the moment and no one was talking about soccer moms or vacationing dads with small cameras (most use cell phones anyway). Yeah, those folks will have to shell out a few bucks for a card reader.
But I'm talking about a professional photographer. We use CF cards and always have, dating back to Nikon D100 and Canon 20D. We now employ SD cards and micro SD for backup and drone shooting. For a professional shooter, card readers have been the easy and inexpensive norm.
The original comment claiming that pro shooters need an SD slot is SILLY. And the 15 dollar adapter doesn't make life any tougher.
Assume we define "pro" to mean "earns a living with their camera", not some elitist "spent more than $x on their camera".
Now, the thing here is, you're starting to get hyperbolic as well. Sure, the high-end Canon and Nikon SLR cameras all have CF (or CFast, or XQD) slots alongside their SD slots. However, the do actually
have SD slots. Additionally, I know plenty of professional photographers who use high end Sony bodies — they're all SD only. Same with Micro Four-Thirds cameras. And before you go off the deep end and try and claim those cameras aren't professional, well, plenty of sports photographers like the longer reach and speed of cameras like the E-M1, and the modern Sony mirrorless cameras are pretty incredible. Even if we stay in Canon land, bodies like the 80D are very, very popular for video.
Just because
you are a pro photographer who doesn't care less about the SD slot, doesn't mean other pro photographers don't miss it. When you're out in the field, it's a handy way of getting a quick look at your shots on a decent screen.
Hell, just as the new MBPs started getting into people's hands, the company I work at
released an app that is literally for people who miss the SD slot in their MacBook Pros — and, this is where the important metric comes in — people are spending money on it.
But, this thread is derailed enough already, sorry. I'm out!