I agree with those who say it would end up being meaningless.
You'd have DPMS and Del-Ton claiming their cheapest models were perfect for the hardest use you care to envision. We already have Vulcan claiming they're the machine guns of the special forces... there's no reason to throw in anything else.
Do the homework, learn what features are preferable for what tasks and why, and then see what the manufacturers offer. It isn't that hard. That stainless HBAR free float .223 chambered 1/12 varmint upper is obviously for different purposes than the lightweight profile midlength 1/7 upper. Figure out what features are worth paying for and know that if a maker doesn't disclose a given spec (for example, you might not be able to find out what steel they use in their bolts if you waterboard the customer service reps), it's probably not because they're so awesome customers would faint at the truth of their awesomeness.
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