Queen -> Larva Inject
Orbital Command -> Mule
Nexus -> Chrono Boost
Two of these are gated behind tech while the third one is not.
Queen obviously requires a spawning pool and a queen to be finished before the first inject can be triggered.
The Command Center can only transform into an orbital once a barracks has been placed also the Orbital transformation time.
Chrono boost can be used from game start.
All of mechanics have been changed heavily since these mechanics were introduced in the beginning, and Protoss has had a major shift after the removal of the mothership core.
Would the fact that Chrono availability so early be the underlining issue to why its hard to find a happy medium with the state of Protoss. Because for a while it has seemed that the race has either been too weak to hurt a fly all the way to over-representation and tournament upsets.
Blizzard usually sides with the more brutal of nerfs leaving players without any options, and returning back to the original problem in the first place.
Alternatively a more subtle approach might be needed.