Because every type of anti-seize (formula) would have a different running running torque and clamping torque, and this type of testing would dramatically increase the cost of said lubricant. Since most mass produced lubricants are manufactured to the lowest cost, the torque values would not be consistent from one type of fastener to the next.
The only thread lubricant that I personally know of that publishes this data is ARP and it's lubricant is significantly more expensive than the stuff you buy off the shelf at an autoparts store. There may be others but that's the only one (ARP) I know of.
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