Anderton
As to missing features, although it would be convenient I doubt any program will ever incorporate all features from other programs...you could come up with a list of things SONAR has that other programs don't have, and consider those programs to have "missing" features.
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The people working at these software companies are creative folks, and will always be coming up with new features. They do this to try and differentiate their programs and have unique selling points. I highly doubt there could ever be "one DAW to rule them all" although if there is, I'd be okay with it being SONAR 
I've never had it run thru my brain with this explanation, but what a great comment. I suppose if Sonar had "everything", then the "too many bells and whistles" crowd would come out of the woodwork and groan....
There are a couple small items I've purchased outside of Cakewalk (gotta love my Toontrack) that I use consistently, but otherwise I'm not missing any features. Besides, most of the features that seem wanted, just seem to be a way to do something with 3 less mouse clicks. How lazy is that?