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Perhaps to allow some games that use tesselation shaders to run, albeit at a slower framerate considering the software fallbacks that are needed for supporting the extension that's unimplemented or poorly implemented in the hardware. That would be a crutch until the user upgrades the card to one that does implement the h/w necessary to support those GL4 extensions.
It's never a necessary feature, so far every place that used it did so for eye candy.
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