Why, then, did they switch from the SD format to micro-SD when they designed the Pi 2? They are amazingly easy to mislay and impossible to identify. Gah!
They didn't - the switch occurred when the Pi B+ came out, followed by the A+ and then the Pi2B
It incurs a cost for those making the change, but avoids the problems with the SD connector (I've had to have three changed, so far, for a more rugged connector - but this still leaves a vulnerability point where a dropped Pi with SD card plugged in can break the SD card (quite easily)