In the high level TvZ games as soon as mutas come out, terran starts building missile turrets all over the map. Approx, 3-4 per expansion and 5-6 in the main, so that is about 75*9 = 675 minerals ( assuming one expansion ), also there will be some PFs etc. Then how come no one gets this research which is just 100/100.
The only reason I can think of is that it will slow down other upgrades. But I still don't know why this has not become part of the strategy, it is just 80 secs, and people have more than one bays anyways.
Best Answer
Generally-speaking, neither Hi-Sec Auto Tracking nor turret spam are the best reactions to mutas. Throwing a turret or two on your mineral line works if you expect continued aerial harassment, but the reaction most pro players have to an opponent going mass muta would be to create a unit-based counter.
Turrets and your other defensive structures aren't mobile. Because of that, they cannot win the game for you. They only keep you from losing. By investing in units that can get rid of mutas, you're investing in something that can also be used to win the game. Overall, that tends to be a better use of your resources.