spewy, you're correct that there are only two ev sources, being (non showdown winnings) and (showdown winnings). however, classification of hand groups isn't the same thing, and it's not all about the betting nor raising ranges. checking ranges count too, and any individual combo fits into one of the segments on the diagram. it breaks down the way it does because of the ways you can win the pot:
a) win unimproved (showdown value)
b) improve a hand that was already ahead (dominant draw)
c) improve a hand that was behind (draw value)
d) make the opponent fold the best hand when you have no chance to win unimproved (fold equity)
e) make the opponent fold a hand that might have improved to a winner (protection)
f) make the opponent fold when you have good chance to improve (semibluff)
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To me, there is no such thing as protection. You never want to protect a made hand, you want to extract max value from that hand. Does that mean that sometimes a player will draw out on you? Yes, but you are still maximizing EV as you are extracting max value for all the times that they do not make their draw. I think you never want your opponent to fold when they are behind, but you want them to pay the maximum amount they will pay to chase their draws.
if talking strictly no limit holdem, then the cost of protection is much higher and thus protection bets are correct much less often. however i think that protection bets(not defined as made hand, but instead any hand that is currently best yet vulnerable) are most certainly a part of equilibrium in any poker game.
the problem i have with the bold is that they don't always have a draw. we can't just base our betsizes such that the draws we're targeting are losing money, as this would benefit the stronger hands in the opponent's range. also, not all forms of poker allow variable betsizes. If we're being comprehensive, then protection most certainly deserves a spot on the diagram.