There's some ridiculously strong timing attacks being enabled by the fact that Terran can traverse their entire tech tree on a single gas. Remember that build I posted? There's actually a much stronger one that was pointed out to me, basically:
12 Refinery
14 Barracks
Factory and immediate Reactor on Barracks when Barracks finishes.
Starport as soon as Factory finishes, make 2 Hellions from Factory and 6 Marines from the reactored rax.
Marines 5+6 and Hellion 2 pop out at the same time, swap reactor to factory, make 2 more hellions, keep making marines.
Medivac when Starport finishes.
With next 100 gas, when Medivac is about half done, start Armory.
Hellions 3+4 will pop about 10 seconds after your Medivac pops. You also will hit 400 minerals at about this point, so start an expansion. Then pull the majority of your workers and take them alongside your 8 marines, 4 hellions, and Medivac to the Protoss base. Start 2 Widow Mines and rally factory to Protoss base. Don't load anything into the Medivac yet, just send it down. Park the Hellions at a cliff overlooking the Protoss main, and send your Medivac to them. When armory completes, morph them to Hellbats, then elevator them into the Protoss base while running into their natural with your marine/scv attack. The idea is to force them to overcharge their main to not die, at which point you can just go bunker their expansion with widow mines backing you up and win easily because it's 2 bases to 1 and you have your tech out.
While immediately reactoring the barracks is risky, I don't see any way to hold this without using a blind build, either by allining them myself or continuous chronoboost (5+) on warpgates research plus a heavy probe cut to get gates 2 and 3 down in time so you can warp in stalkers in time to deny their drop. If you deny the drop you can overcharge the expo and hold easily. Protoss players honestly tend to play very greedy in general with only 1 or 2 chrono boosts on warpgates, if any at all, so this build just slaughters them. If they went 17 Nexus or Gate Nexus Core they won't have overcharge ready and will die no matter what they do.