Two years ago when the OP said they didn’t like updating the cams individually, there was no bulk update mode. Today with only 3 presses you can update all of your cams, bridges, bulbs, and plugs at once. (Account > Firmware Upgrade > Upgrade all)
On having an additional option for the updates to be automatic, I think that’s risky, but you can submit that as a wishlist item if you like:
Here is another related wishlist item you may be interested in voting for: