Apple DOES let you do that, get the camera kit like you are supposed to, back when I had a starter DSLR that only shot 10 megapixels I did it all the time.
Now my new DSLR, I did not even try because why in the world would I want to load up my tiny 64gig of storage space with 24megapixel photos when I have 5 32gig memory cards on me. and 32gig cards are dirt cheap.
Oh and please tell me WHAT android tablet has a standard USB A plug on it for your camera, you seem to be making things up about your complaints. Every single android tablet I have owned, Nexus 7, Nexus10, you have to do major hacks to get the micro USB to act as a host, certianly out of reach for 99% of tablet users.
Lastly please tell me what this fetish is with the newbie photographers wanting their DSLR connect to the tablet? there is no good reason at all for it. Slow usb2.0 transfers take forever and a day if you think you will be showing a "client" the photo. if you really are desperate to look like inspector gadget, buy EyeFi cards and transfer them wirelessly, that way you can shoot RAW+JPEG and have the jpegs go to the tablet and have the RAW files for real processing later. If I really need to show a client a photo, I simply pull the 15" laptop out of my camera bag and show them. But I highly discourage this as those are raw photos and breaks the flow. They can see the proofs later when we meet and I have had time to deal with them properly.