Well, AFAIK the typical Apple fanatic does not really care about it being "unibody" or if there is "multitasking" or not.
The typical Apple fanatic cares about it being an iSomething device by Apple (TM)

If Apple tomorrow introduced device exactly like this new Jolla device, it would be an instant success all over the world and the talk about it's new advanced features would not cease for months.

You need to realise it's not about the products, its about the brand.

Weel that's just shortsightedness on the part of the HW vendors, and it might be part licensing agreements with large OS partners (read: Microsoft) as it is more on the liking of closed source shops rather than the HW vendors to keep the drivers closed.

As for closed drivers keeping the chip internal design details hidden, yes that might be the purpose of it but if it's so then it is futile as competitors can (and do) reverse engineer the HW designs routinely as fast as the first chips roll of the FAB
This is not even "industrial espionage", it's called "corporate intelligence" or something like that, depends on your your company.

And about having open drivers, consider the most advanced network chipsets from Intel, for example. The company has its own team of people to develop the open source drivers for their cards and the people are active on Linux kernel mailing lists and DO answer your queries promptly. (which I know, having worked with them)

Well ya never know, if there is going to be more open source devices, sooner or later HW vendors will see that it's their obn benefit to have open drivers for theit chipsets/gadgets.