Yes, and it sucks, but it has been this way for a pretty long time. Jobs was never about expandability/hackability -- the original Macintosh required a special tool to open the case, wherein you could do nothing to it as it had no user serviceable parts. I had never looked before, but it doesn't appear that it even had any socketed ICs: http://en.wikipedia.org/wiki/File:Macintosh-motherboard.jpg , but it did have a proper font silk screened on this board that nobody ever saw. Jobs has used engineering as a means to create the experience -- Woz used the experience as a means to create engineer{s, ing}, something that I owe my love of computers and even my nickname to. :)

That said, so long as Apple essentially has a monopoly on the smartphone experience, it behooves them to control the experience of the device (via third party applications) with an iron fist -- there's very little down side to arbitrary or even counterproductive behavior so long as the experience is maintained. Should ecosystem ever matter more than the device experience, Apple will be forced to sing a different tune, but given Nokia + MS's head start and performance since the release of the iPhone I wouldn't be hopeful.