I often hear the question of which blade one should have for one's survival gear etc. Often it's implied that one can only have one blade that does it all, because it's what you need to grab quickly or whatever. I don't agree with that. One can easily have more than one item on oneself or in a car or alike.
So, if you really like the RC-6 for example, but feel that it doesn't have a good pommel to break car glass windows, then just bring a smaller object along with the RC-6 kit that will perform that task, such as a small glass-breaker or even just a sparkplug.
If you like the RC-5 but feel that it won't perform as well with carving tasks, then get an inexpensive little slicer and tape it to the sheath of the RC-5 or whatever.
Jack of all trades, master of none, is the inherit trait of an allround blade. However: Jack of all trades, master of none... is usually better than master of one. But, that doesn't mean you can't bring more gear with you.
If I'm in the woods for instance, I'll bring either a RC-6, or a Fiskars J.P. Peltonen M95, or a Fiskars axe or a CS Gurkha Kukri for chopping tasks. I'll also have a smaller blade for slicing and carving, such as a Mora 2000 (serious slicer/carver) or a Benchmade Nim Cub II (not as comfortable but it's a good slicer/carver for a non-scandi grind knife). Oh, and I've always got my Leatherman Wave too.
If I'm in my car, I'll have a long Mora blade for mercy-killing animals that have been run over and are suffering and I've got my steering wheel lock (Roc Bloster) which is tougher than a baseball bat and it will definitely crush a car glass window. Yeah, I don't have a prying tool, but I suppose I'll just add that to the list. I've pried some heavy stuff while working construction and I wouldn't even assume that I could use a RC-5 to pry open even half the stuff that we failed at with our smaller crow bars. But, it's still a good tool to have and it will do better than nothing. One can always improvise leverage with a large rock or something.
I'm saying that you should get the knife that you like and complement it with whatever items that will perform the tasks which it doesn't.