That is a blatantly false dichotomy. You wouldn't use a browser that did not let you access potentially malicious pages at all, but you wouldn't want one that gave you no protection either. And so you run Chrome which gives you a scary warning page but lets you go see any page if you really want.
I really don't buy that Apple's absurdly draconian control is better than something akin to Chrome's warnings. You should make it difficult to install something potentially malicious by accident our without thought, but you should definitely not go out of your way to stop determined users from installing what they want either! Apple goes well beyond the reasonable and helpful and into the absurd.
There's nothing false about this dichotomy, you're just setting up a straw doll.
My point stands, we tried the run anything model and millions of machines are infested with malware as anyone with any basic computer experience can attest.The number of times I've had to clean friends or families computers I cannot count. There is a very good argument for these sandboxes.
The issue isn't security. The issue is control. The Debian project uses signed packages to ensure integrity but is open regardless. Of course there should be security and a reasonable expectation of utility but not at the cost of free use of something you bought and own. The tech industry is moving to a concept that you "rent", for lack of a better term, rather than own something you purchase. I have no issue with commercial software but all software is useless without the hardware to run it. If I have the hardware, I should be able to do what I want with it, just like an automobile. What's the difference? If a car manufacturer decided which highways you could drive on, based on a restrictive license agreement, you wouldn't buy that car, but you wouldn't buy a car without seatbelts. We wouldn't accept this concept in any other situation, why do we accept it in this situation?
Empirically, you're wrong. In order to install random plugins, Firefox makes you click through a dialog that you're forced to read because the install button isn't active for a couple seconds. People fill their browsers with spyware anyway, because they want the {smilies, titties, stolen movies, etc}.
To tell the story again: my brother runs a cash intensive business that regularly moves hundreds of thousands of dollars a month. He narrowly escaped having a mid six figure sum stolen after his computer was hacked, and his solution now is to have a separate laptop that is only used for accessing the bank website and not a single other site on the internet. He's not stupid, he makes way more money than the majority of people reading this, and he finished a math undergrad with honors. And yet his computer got spyware on it that harvested the bank login. It's time to admit that our current security models have absolutely failed their users. At least on an ipad it's more likely than not that an application that will run is safe to run.
I really don't buy that Apple's absurdly draconian control is better than something akin to Chrome's warnings. You should make it difficult to install something potentially malicious by accident our without thought, but you should definitely not go out of your way to stop determined users from installing what they want either! Apple goes well beyond the reasonable and helpful and into the absurd.