There are a few points to address in this thread.
First of all, while the overall value of 16 vs T as an index may be high, its value at precisely TC=0 is tiny. From a practical point of view you could choose to do whatever you want and it won't affect your bottom line.
From a precise technical point of view, the index is to stand at TC >= 0 or, for simplicity RC >= 0.
To address the notion of hitting with two cards and standing with three or more cards, this is a well-known basic strategy improvement and applies only to basic strategy players or at the top of a new deck/shoe only. It works because you can not have a 2 card 16 vs T at the top of the shoe/deck without the running count being negative. This is why it is a basic strategy hit even though the index to stand is zero. It is a common misconception that basic strategy is the same as playing at TC=0. There are some 3+ card compositions of 16 vs T for which the running count is negative (e.g. 9,6,A vs T), but for the vast majority of them, the running count will be zero or positive. So standing based on 3 or more cards is also mathematically correct at the top of the shoe/deck. Once again, the gain is negligible. If you are counting you should be using the count alone and forgetting about this rule.
A similar situation exists with 12 vs 4.
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