If you're a pro who relies on paid work then you really ought to have a 5D MkIII. Otherwise you're clearly just being a cheap-o and then complaining about lack of features. Buy the right gear for the job.
Precisely what Canon thinks too.
But the truth is - dual card slot isn't just for pros.
I'd hate to lose photos on a high dollar vacation on the other side of the world, or a precious moment with my children. It is for anyone who wants to ensure their photos are safe. Yes, that does include a large segment of pros.
But again, Nikon offers it on the D7100 and D7200. Is this a pro camera? Are D610 sales being hurt? How about the D610, it has 2 slots, is it killing the D810?
"Buy the right gear for the job" ...excellent advice. And kind of my point all along. The right gear for the job won't be Canon's gear. Because if data redundancy is critical, $3,700 is the entry point for Canon. $1,400 is the entry point for Nikon. That's full frame. For crop, it's about $1,000 Nikon, $1,800 Canon.
Cheap-O is not me. It is Canon, who charges over $2,000 for a camera and doesn't put a second SD slot in it. With the dirt cheap price of memory card interfaces, Canon is being real stingy here.
+1... anyone ever remember the good old days of shooting dual-roll 35mm? neither do I.
That is an awful, short-sighted comparison for sake of a poor argument - since 35mm film does not just fail. Surely, if you accidentally expose it. But that is user error as would be formatting your memory card, or dropping / damaging it. Memory cards just fail without any user interaction or error involved.
On its own, a 35mm roll does not.
On another note, when I argue in favor of Canon offering a feature - why does a flood of people come out with snide comments against me? It is bizarre. Is it some kind of blasphemy to expect a simple feature? Why all the apologists defending Canon? Are these Canon employees or something? Does Canon need defending? Are they worthy of it? Has Canon been unjustifiably wronged or something by a consumer seeking a feature and calling them out on it?
Strange indeed.