Just because there is a duopoly instead of just a monopoly, does not mean that your argument has weight. It embodies how anti-consumer and anticompetitive the smartphone market has become and makes a greater case, not smaller, for regulatory action. The sales numbers make it overwhelmingly clear: Smart Phones are the most widely available general computing devices on the planet. And yet Apple refuses to allow consumers to choose what they run on them. There's an open question of whether or not you will have that ability on ARM Macs moving forward. You don't own Apple devices anymore. You can't fix them. You can't choose what to run on them. Worse of all, the rest of the industry follows their lead, since they make a majority of the profits.
I'd hardly applies just to the smartphone market, on the non-serviceability front Apple followed the lead from others, as its been the mantra of many industries for years prior to the iPhone.
If my phone was designed to run some Opensource OS on a reasonably generic device (Android), I'd be more than a little peeved that I cant run what I want.
But when the entire device, hardware and software has been designed from the ground up and sold to me as a package deal, with those lockouts in place (with good reason IMHO) .. I certainly do not feel short changed even if I pay a little extra for the privilege.
Personally I feel that the Entire Apple Brand would be irreparably tainted at the very first instance that a widespread malware app was introduced through a third party Appstore, device slowdowns, database of users hacked , or daddy's credit cards emptied by some fake Appstore.
It would make zero difference to the public that Apple were only acting on a court order, it would ONLY matter that it happened at all and that it was on an Apple device in the first place. A scenario that could, and in my opinion should, be avoided at all costs.
I own an Apple device, I know its limitations, and I'm aware of the costs - I'm also well aware of far greater cost of sharing my data to untrusted third parties, and the lengths that third parties will go to in order to exploit loopholes in ANY slightly open system.
A cell phone at this point in time is, in most cases, a far more personal extension of a person than any computer and the information gathered far more exploitable.
Allowing third party apps to be side loaded, or third party App stores IMHO would simply level the playing field for that exploitation to take place.