06-29-2017, 08:12 AM
Cameras don't have flash memory inside, because it would never be enough, at first (why do have phone Micro SSD cards as extension?). And what you say about reliability is only one side of the medal.
You travel somewhere, take loads of pictures and the day before you fly home your camera gets stolen. Together with it's flash memory, with all pictures of course. Which, btw., makes the camera much more expensive if it's "big enough for most people". So, you loose even more money. SD cards on the other side are easy to buy on a lot of places. And, if they are not too big like 256 Gig, they can serve as backup although careful people will carry a backup device with. Cameras with two card slots always can store redundant, identical backups with no more effort.
You travel somewhere, take loads of pictures and the day before you fly home your camera gets stolen. Together with it's flash memory, with all pictures of course. Which, btw., makes the camera much more expensive if it's "big enough for most people". So, you loose even more money. SD cards on the other side are easy to buy on a lot of places. And, if they are not too big like 256 Gig, they can serve as backup although careful people will carry a backup device with. Cameras with two card slots always can store redundant, identical backups with no more effort.