Am I the only one who finds that a SD card slot that holds an SD card is a great way to hold extra data? I keep a 256 GB one with low-use archive data in my SD card slot, symlinked into the main file system.
Frankly I wish they could put 2 or 4 of these slots into a laptop. I would use one for portable data I expected to move to other computers, one as a generic storage enhancer, and one other for my automatic image backup.
The latter I would really like, I can keep at least 5 restore points in 512GB for my system's 66% full 1 TB boot disk if I run the backup cycle daily. Create an incremental at every boot and then auto-dismount to protect it from malware or accidental overwrite.
My summary of this whole Macbook Pro issue (and I don't even own one) is that one side is arguing that "nobody" uses the missing features (SD card slots, USB ports, etc), basically arguing that because the *average* user doesn't use them, it's a waste to add them.
The other side seems comprised of the actual power users who have use cases for them and think that a product should be offered that addresses something other than the average user.
At the end of the day, the whole thing seems to boil down to millimeters and ounces of weight.