Whilst I often wish I could install the local development environment of my choice onto my Pro, having seen the crap that grinds all my dad's computers to a halt (he's one of those that sees something and just installs it) the "sandbox the shit out of everything" approach really makes sense to me.
It's more than just sandboxes. Android grinds to a halt just easily when you install crappy apps.
For example, I used a German classifieds app called Shpock for some time. After I uninstalled it, I noticed that I got around 50% more mileage out of my phone's battery.
As far as I've heard, stuff like this is not as prevalent on iOS because Apple enforces stuff like background scheduling more strictly than Android does. It's not just the sandboxing, it's the behavior of the interfaces that the sandbox offers.
Android seems to be taking a page out of iOS's book with the introduction of Android O and its restrictions to background services.
Never again. It's not even a question of the software being that of a glorified phone.
Even using a 3rd party code editor with its software 'coding keyboard' it was an exercise in inefficiency and anti-ergonomics. So by the time you've added a Bluetooth keyboard, you've effectively got yourself a ramshackle laptop that isn't quite as useful as an actual laptop.
It's not a laptop, because it's missing crucial laptop features (ability to do work on it). And it's not a phone because it's missing crucial phone features (portability and calls).
So when mine broke, I just didn't feel it was worth replacing. I've lost no value from not having an iPad, because everything it did could also be done on something else I own.
I feel Jobs saw the value in real computers even if a bit more locked down than self built they were still real computers. Compared to Cook who doesn't seem to understand or even like computers and thinks the future is in devices.
I just don't see why Apple can't accept that iPads might be great for kids, people who purely use machines for consumption and my parents but iPads are worthless to some of us who need to actually use the full potential of computers.