It all depends upon ...
Varying your bet size relative to the count is the primary factor that "gets the money" for card counters. The wider the bet spread the more true this is.
Basic Strategy Depoartures that are keyed to the True Count are important in one and two deck games but is relegated to a lesser factor in shoe games.
Some plays are important, but most of the 200+ indices are worth only "chump change"
The top dozen or two plays capture 90+ % of the power of varying your card play.
See "The Theory of Blackjack" by Peter Griffin for the actual values for all of the plays. But better yet purchase and study "The Illustrious Eighteen" and "Fab Four" in "Blackjack Attack", 3rd ed, by Don Schlesinger.
I will tell you that the most crucial departure index is for INSURANCE. Knowing what to do with your 16 vs. a dealer's Ten is valuable. The play that you mentioned has little value. Remember that there are indices that aren't really worth anything.