digital - Why does DSLR technology seem so primitive?

I am curious to know why today's DSLRs (including the top of the line ones) have:

1. A primitive interface


2. Do not do wifi out of the box


3. Do not have touch interface


4. Do not have full fledged OS like Andriod or the iOS and the like


5. Have very poor screen resolution and the list goes on.

And this, I am comaparing with a cheap 50 dollar android phone. Your specific reasons/answers are much appreciated.