Oh also I saw this quote from an ex Valve dev:
My condolences to anyone who wastes time playing prerelease versions of P2 or L4D2. Listen, every good idea we had went into the final thing we shipped, and anything not in the final version was not a good idea. https://t.co/S4mTllUy3F
which to me really misses the point of why people want to see prototype releases.
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