This is of course, accurate, and Pancho misunderstands what exactly it is about "beginners" frames that make them beginners' frames. It has nothing to do with weight, as the difference between a granny stick and Ivan Lendl's old bat is small enough that it wouldn't render an infant incapable of hefting it.
What a beginner's racquet is designed to do, and what a player's racquet absolutely ISN'T, is to bunt the ball in a general direction, and have the resulting flight of the ball go more or less in that direction, with a little bit of pace.
That's a beginner's trait, because that's about the only style of play that will allow a true beginner to get the ball in play in a reasonable fashion. Point and shoot, no fundamental mechanical understanding necessary. When a ball, even a fairly fast one comes at you, you can sort of hold the racquet out and direct the rebound where you hope it'll go. Try that with an 03 Tour, and you've got a lot of balls wangling off the court and into the fence, or dribbling into the net.
"Ultra Light Weight" is a marketing gimmick, nothing more. Beginner's frames weren't super light as recently as the Wilson Profile era. Heavy, stiff, powerful frames are actually far better suited to the "bunt and hope" game, which basically requires the racquet to do its best impression of a wall. But Head started the whole titanium thing, and on a whim, screamed, LIGHTER AND MORE POWERFUL!!! REVOLUTIONARY!!! And the suckers of the world bought in, because they had no idea about physics. They're still buying in today.
So anyway, nobody who refuses to acknowledge the idea that a POG (or other players frame) might be too heavy for a beginner is suffering from any lack of knowledge. In fact suggesting that lightness is an important factor (or a desirable trait) at all at that level showcases a certain ignorance of both marketing history and physical laws.
That said, there are plenty of good reasons to advise CERTAIN raw beginners away from a players frame, and plenty of good reasons for more advanced players to choose relatively lighter (or heavier) or relatively stiffer (or more flexible) or relatively bigger (or smaller) frames. Once you are adept enough to understand your own game, your reasons for choosing a particular frame composition can be a little more rational and important.
Despite all that, though, I still say everybody should just shut up and use the POG.