The issue isn't the pitch of the headstock, it's that it's cut from one piece of wood which means that you have short grain running right out into the angle of the headstock. I'm an amateur luthier, but a fairly experienced furniture maker, and anybody familiar with wood construction can tell you that putting short grain under a lot of stress is a bad idea. The purpose of a volute on most guitars is not decorative, it's there to stiffen up that part of the neck. A scarfed neck joint is inherently much stronger unless you have a pretty hefty volute. I'd call any design feature that results in a well known tendency to break at a predictable location, and then continuing with that design for decades, a design flaw. Your semantics may vary. Ric strengthens their necks somewhat by using multi piece laminates, never seen that on a Gibson, but then I'm no expert on Gibsons. I have witnessed a Rick knocked off a guitar stand, and the headstock broke off right where you'd expect it to, below and around the truss rod adjustment pocket. Google "Gibson Broken Headstock" to see the problem illustrated quite clearly.
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Fixing a broken Gibson headstock - Strange Guitarworks
How to repair a broken guitar neck (headstock)
Guitar Repair Las Vegas, Broken Gibson Guitars - Poorly Designed and Overpriced
Guitar Specialist - Guitar repair and restoration services - Guitar Repair - Headstock Repair
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Sense a trend developing? Nope, not a design flaw. Nope.
Oh, come on! OK, semantics; whatever. The pitch is the issue because it's a one piece neck and because of the grain we see in the picture. Whatever point of view you choose to look at it from. Still not a design flaw, in my book. It's guitars, not objects designed to fall of stands and/or absorb impacts. I stand by my position of design with "obligations". Like the guitar Kurt Russel smashed in "Hateful Eight"; what a piece of garbage! Couldn't even withstand a little blow like that!

You haven't seen a Gibson with laminates? Well, have you heard of it then? They're out there and plentiful; not desirable. Players want one piece necks; for whatever reason you can think of; and a lot of time only for the fact that it's a one piece, even. I know about Gibson headstocks; I'm a member on The Les Paul forum and My Les Paul. You can call the headstock an Achilles heel' if you want; and as a physical object; that term is correct. But as a guitar; it's a very, very small issue. And an issue players gladly will deal with. Again; a volute is in practical terms (on say: a one piece (excludes wings) mahogany oval or mod v etc) decorative on a guitar. This is C.F. Martin's position, but you know better? Why don't you call them up and tell them they're making their guitars wrong, and that they should go back to scarfed neck joints?

Why are Martins so good? It's because they are built very lightly. And every successful acoustic steel string guitar maker basically makes their version of whatever Martin they're copying. And Gibson's best acoustic IMO; the Advanced Jumbo; was made to compete against the D-28. I have a Martin 000-28VS; and I know the thing is fragile. But the tone is the stuff of angels, so I'll deal with potential future problems. What I don't want; is a overbuilt, non scalloped, dead acoustic. If that were the case; I'd buy a Takamine and only play plugged in. You can't go "all science" with guitars; you have to have the art in balance with it. John Suhr said something that I like about the difference between making guitars and amps; He said that making an amp is very much a science. You have your design, specs, tolerances etc. and you make the amp and you repeat and get the same result; while making a guitar is very much an art. You feel stuff, the wood, textures, and all of that. There's also a huge emotional component with guitars for players. If you think what's posted here on tb is bordering on the insane sometimes; go to the Les Paul forum or an acoustic guitar forum; and watch people go Damn you all to Hell over the most insignificant things possible; like the shape of pick up covers and the patina of end pins... and they x-ray the guitars too!

But!! It's great! that these forums exists; because these "crazy guys" has pushed for positive change and that has resulted in better guitars; like the current Custom Shop Les Paul guitars. The Les Paul Forum has actually changed how Gibson Custom do certain things. And the guitars post 2013 have been spectacular; I can't deny that. The Custombuckers, the weight (light), thinner finish, and a long list of other stuff; has really made a difference and gotten the guitars very close in performance to real Bursts.

They're responsive and alive.
The best of my 3 is a 2013, and if I can somehow get 2 more from these later years; the other two I've got now and which I love; will be GONE!

But seriously though; I'm fine with your opinion and I can see where you're coming from; because what we're really talking about is degrees of stuff and how much/little is acceptable. So your "flaw" is my "nothing" or perhaps even "desire".!

I want one piece necks without volute on my Gibsons, but with volute; "ice cream cone"; on my Martins. So 2+2 equals 5,3 or 4 all depending...; you know?
I hope I never drop any Les Paul to the floor, and I sometimes hit cymbals with the headstocks of my Fender basses. And my "perfect instruments" is my Sadowskys.