I would say for the better golfer (sub-10 handicap) the swing tips found in major publications should be pretty much ignored - not becasue they give bad advice - but becasue they don't take into consideration every golfer has a swing that is unique unto him/herself. Everyone has their own natural swing that is outside of the textbook swing the guru's would have you think is the answer -- they take the club back a bit too inside, have a steep of an angle, they may lay it off a bit at the top, maybe they have a very strong grip, etc.... BUT THAT IS OK... the foundation is a
natural swing
that can be grooved to make a repeating swing (which, in my humble opinion, is the most important component of a swing - one that enables someone to play consistently good golf). Of course, everyone has to have the fundamentals down (alignment, position at impact, etc.. - and for these things, the magazine tips aren;t half bad) - but beyond that, it really makes sense to fins an instructor who can work with what you have and make small, sensible iterations to it to procuce a repeatable swing....
There are a lot of very, very, very good golfers out there who have honed swings that are outside of the box -- Daley (way past parallel), Price (very quick tempo) Nicklaus (look at that right elbow), Leonard (flat on top), Sergio (lays it off on top), Furyk (no comment necessary), Trevino (look at that setup), .. the list goes on and on.... I guess what I am trying to say is stick to your core swing and work with someone who understands that not all golfers fit into a profile....