The issues addressed in the table of contents appeal to me; but I expect you're right, that there would only be cohesiveness within each section, not between them.
BTW: I've heard good things about Objective-C. Any idea why it was not successful outside Apple? Was it because of Apple's proprietary approach?
As far as I can tell (as an amateur mac developer), the major advantage Objective-C has on the mac over other platforms is the extensive support that Cocoa [1], Apple's giant grouping of APIs/Frameworks/etc, lends. It's so helpful, in fact, that many Mac developers refer to programming in Objective-C as "Cocoa Programming" (also, it's the title of the best programming book I've ever read [2]).
Sounds like it's branded/positioned as "Cocoa"... and possibly support is lacking on other platforms (I guess you mean libraries - they're crucial for language success).
BTW: I've heard good things about Objective-C. Any idea why it was not successful outside Apple? Was it because of Apple's proprietary approach?