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^ Based on what I've heard and read, that's not true.
And what I've heard and read is that the aerospace industry (essentially NASA and airplane manufacturers) are getting today's high quality graphite, while other industries (like the racquet industry) have to settle for the leftovers... resulting in today's crappy, no feel frames, etc...
That's not quite right. Or at least a major oversimplification. There are two errors made in your interpretation. The first is about how the graphite market works. Aerospace companies are indeed among the primary users of (and highest payers for) graphite ...as well as various other materials such as titanium. But the materials companies make whatever grades companies want and are willing to pay for. So there's no such thing as a shortage in the outright sense. They make as much as there is demand for. There is a HUGE variety of types, formats and brands available to today's racquet manufacturers, and most of the factors that affect quality are determined not in the raw graphite material (which is just carbon), but in how it's used in the tubes and rods that are eventually used. Depending on which stage of manufacture the racquet company becomes involved with the materials (it varies by company to some small extent), the greater factors in frame quality are construction and design, rather than carbon itself.
What the article(s) you're referring to may have been referencing is the fact that most frames are now made by a few OEMs in China, and in order to maximize profits, they (NOT the racquet companies, per se) often cut many corners. This can happen at the graphite sourcing stage, and it is possible that some OEMs buy surplus graphite to save additional money, but more often happens with respect to the already formed materials, and in terms of production standards. When most people refer to "quality" or to something being "crappy", they are talking about quality control. This affects consistency, breakage and related factors. And the single greatest factor in tennis racquet quality control today is money. Manufacturers are given a choice of tolerance levels by the OEMs, and the choice made is based on what cost per piece the racquet company is willing to pay. The choice of how "crappy" to be is one of cost, and is an elective decision, not one forced on anyone by the aerospace industry or the availability of graphite. Unlike USDA Prime beef, there isn't a finite amount of graphite that can be created. And any use of surplus materials is a choice made by the OEM as a cost saving measure. If the specs the manufacturer gives the OEM are specific in terms of material, then those are the materials used.
The second apparent misunderstanding you've taken on is that the "quality" of the graphite is what is causing frames to feel the way they do today.
However, rather than being quality-driven, I have the sense that your definition of "crappy" refers more to the "feel" of the frames, which has almost nothing to do with actual quality, in the way the term is used in manufacturing. Quality in manufacturing is purely a matter of consistency. Frames that "play poorly" and have "poor feel" are the product of changes in design, not changes in the quality of graphite. You could use the "best" graphite on the planet, but if you're putting it in the same exact layup, and processing it using the same mold, you're going to get a racquet that feels almost exactly like any other using that layup and mold. It's kind of like gasoline octane in consumer cars: there may be a difference in theory, but you can't feel it in practical use...and other factors affect performance in a MUCH more notable way that's often confused with what you think you're feeling. Your standard consumer family sedan won't go any faster with a two point jump in octane, and your tennis racquet won't feel any different with a tighter tolerance grade of carbon.
It sounds to me like your real issue is with the direction in which racquet design and its effects on manufacturing have gone. In the quest to make frames lighter over the last decade or more, the way they are engineered has changed. With the advent of the power game, and the desire to imitate the pro game they see on TV, many players don't care as much about feel as they used to, so the market doesn't really demand that characteristic as much as it did previously. The market has essentially demanded lightness and power over (or at the expense of) feel. Further, the tennis consumer market has been very resistant to price increases. That's why frames cost about the same today as they did 20 years ago, even though they would be way more expensive if they had kept up with the standard price increases in most consumer goods. And to keep the prices so low, manufacturers went exclusively to offshore OEMs and allowed their manufacturing tolerances to broaden. Those factors are what is changing the way racquets feel, not the notion that you can't get good graphite any more. There may be less physical graphite in the average frame, in an effort to make it lighter or cheaper, but the quality isn't a significant factor.