Their App Store is a monopoly, but I have friends who use iPhones and use Google's Inbox, Google's search app, Chrome browser, Google Maps and Waze etc and don't use the built-in defaults. I guess they like the hardware. So maybe I'm not interpreting "completely closed" correctly.
> ... In the name of user centricity, their platform places arbitrary restrictions on code execution and access.
As a software but non-iOS developer I like these restrictions. Yes they can be annoying (you can't use your iPhone as certain kinds of portable network scanner because they restrict access to the MAC) but they also stop shitty and malign developers from screwing me in certain ways (jerks were using the MAC as an illicit user tracking device).
I see it like various sorts of regulation: everyone us better off if the paint factory can't simply dump its waste into the river, even the paint company.