> [USB-C] in-fact until yesterday was only supported by one single machine made by Apple
Really, have a look at this [1] half-year-old list of 10 non-Apple laptops that have USB-C ports... Of course pretty much all of these have USB-A ports too, because their manufacturers don't have a blind following and actually have to compete with each other.
I didn't want to say that USB-C was only supported by Apple.
What I meant was that of all the devices that Apple makes, until yesterday only one supported USB-C, so shipping the new iPhone not just without Headphone Jack but also with a cable that can only be used with the minority of all their computers would really have been a strange move (plus, there's no small USB-C power brick yet, so they would have had to produce one of those too - or give you their 29W one for free which would probably have been a bit too expensive)
Really, have a look at this [1] half-year-old list of 10 non-Apple laptops that have USB-C ports... Of course pretty much all of these have USB-A ports too, because their manufacturers don't have a blind following and actually have to compete with each other.
[1] http://windowsreport.com/usb-c-laptops/