Given that this conversation has gone so far already I doubt I'm going to say much truly unique here, but here's my two nuyen:
I don't see Skills as the A Priority as a Trap. Unwise for the majority of builds? Assuredly! Not optimal? Oh, definitely. I wouldn't go so far as to call it a trap though. In my time playing Shadowrun and interacting with players new to the system and tabletop games both I've very rarely seen someone actually want to go for Skills A on their first character. Usually they come in with some sort of concept or idea, however loose or vague as they may be, and work toward toward that. Sure, I see a lot of useless skills get picked up and never used, but I've only seen Skills chosen at A once or twice. Usually the highest it gets is B and that's just because of the free Skill Groups.
My opinion is that anything at Priority A is a trap in so much as the big numbers are so very alluring and pull even vets in there to see what they can't make work. Resources A gives just so much money to play with, Attributes A gives you such a good starting point, and Metatype gives you all of the Edge. Magic/Resonance A gives you so many different choices and opportunities that it's ridiculous. But that's the point of the system. All the high ranks in the Priority Structure are alluring and they make you really have to figure out where you want to start and what you want to focus on. I won't say everything is as viable as everything else, but I think Skills A is far from the worst choice a new player could make.
That said, a point that might want to be made here is what "It's a Trap" really means. If it means that it's sub-optimal then forget everything I just said. I don't think it's optimal for anything but very specific builds. But if we're saying that Skills A is a siren song that lures new players into the hazards and cripples their characters, then I strongly disagree. Almost any build can be made quite strong with Skills A. It just won't be the best it could be.