I recently passed on the new Nikon Z6 and Z7 based on (0nly) one card slot. I did the same on the Nikon D7500 last year for the same reason: CDS ("Card Deficiency Syndrome"). HOWEVER, merely one card was just fine for me when I pulled the trigger on a Fuji X-T20, as my intended use for that camera was totally different.
So, it really kinda depends, but what I'm interested in is this: in an ideal world, what is the 'proper' number of card slots in a camera, to have a camera configured to your liking?
Please comment! Thanks
The less serious you are about your photos, the less you need more than one card slot. The more serious you are, about your photos, the more you want two card slots. Snapshooters, newbies who will probably soon abandon photography, etc, can get by with one memory card / slot. Serious photographers / Pros generally want the security of two card slots, so they can record duplicate images to each card, and have a backup in case one card is damaged. I have an old Nikon D3300, with one card slot, and that serves well enough when I want to use it. It cost me just over $400.00 years ago. Generally, I now use a camera with two card slots, such as my Nikon D7200, or a D750. When it comes to paying prices near $1,000.00, let alone $2,000.00, or more, I demand two card slots. I won't be moving to mirrorless until I am offered a camera with two card slots. I can get by with my current DSLR system until either Nikon offers me a two card mirrorless camera, or I decide to get a two card slot camera from some other manufacturer.