I think the biggest difference between Protoss and Terran is that with Terran, you have to actively pressure your opponent the ENTIRE game.
Not always true. In fact I find that Protoss is usually the one who has to actively pressure.
Example: TvP: gasless 1rax expand vs 3gate expand (e.g. Tal'darim Altar, Shakuras) - if you can hold off any assault your mid-late macro army will be much stronger with your upgrades starting up first.
As Terran if you do 1-1-1s, then yes, you have to pressure because you've invested a lot in tech and opportunity costed your macro.
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