Same goes with PvT where the Protoss cant really afford the fast 3rd: every fast 3rd build requires you to stay on low unit/low tech and spread your army out so thin to be able to deal with multi fronts attack. White-Ra did try out some prism harass into fast 3rd but Terran(Select) could then just immediately counter attack and destroy the build.
The reason for this phenomenal is because terran tier 1 (marine marauder stim) is really strong in PvT, same go for Hellion in PvZ. These help Terran player gain early map control therefore the ability to fast expand to 3rd. Best example for this play style recently could be:
+ Show Spoiler +
+MVP vs Leenock where MVP pressure with hellions and place down double CC(2nd and 3rd). Semi Final code S
+JYP vs bomber where JYP get a really fast 3rd nexus and got crushed by multi fronts pressure. Code A ro32
So the question is, is that really possible to obtain a fast 3rd base vs Terran in the current meta game without taking risks? Given map such as Calm before the storm or belshir or antiga where 3rd is not blocked by a rock.
Please avoid balance discussion and focus more on strategy construction.