It is so because, Nc4 allows white to create a dangerous g passed pawn. With Nb3, black attacks c3 pawn, then threatens to take on d4. Okay c4, dc4, d5, Rf6, Bxc4, Rxf4. This is an equal position, black has one more pawn, white has no kingside pawn majority but its rook is on the 7th rank.
Capablanca-Tartakower 1924
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OK, so I asked this question earlier as if it were about the meaning of a 0.00 evaluation from a chess engine.
Maybe it's better to ask about the game itself. This is the rather well-known game Capablanca-Tartakower 1924.
After move 31.g4 by White, Komodo 10.1 recommends 31...Nb3 for Black. This move is not even mentioned as an option in the book I'm studying, so I became curious and went looking for other analysis. It is hardly mentioned anywhere online either.
So, I let Komodo chew on it all night and ... well ... I'll just provide it here. The result is 0.00 across seven variations and many dozen subvariations. That just seemed odd to me that so many lines could be dead equal, so I figured I'd post it and see what ya'll think. In the actual event, Capa did win the game with White.