Also in SC2 i feel like it is a worthy endeavor to put a turret AND bunker to protect your mineral line. At higher levels maybe it doesnt apply, but for the majority of players the ability to devote less attention to defending harassment would help them win games as theyre focusing on macro and attacking. Plus if theyre able to stay out of range of both you can still pop the marines out and provoke. Given the fact that late in the game when bases mine out you can just put the marines back in your army and salvage the bunker. Whole thing costs 25 minerals per base.
I ask because at the highest levels you dont see these things but i feel like theyre cool tactics. Thanks