But then again, Zerg can threaten your base with Nydus worm. If your recall is down, you can’t move out without risking it. Massing anything is also terrible when Zerg have Broodlord infestor and know how to position themselves.
But then again, Protoss can threaten your base with Prism. If your recall is down, you can’t move out without risking it. Massing Siege tanks is also terrible when Protoss have Zealots and know how to a-move.
Terran have weakest transport. As Protoss, you risk 250/0 by attempting but failing massive warp in in enemy base, as Zerg that attempt costs you 50/50. Terran? 500/100 for one medivac full of marines, all of which can be lost if medivac is intercepted. As Terran, you need army on the map to even attempt drop, exposing you to weakness, as Zerg, you have instant teleport home, as Protoss, you would need to rely on recall, but it still is an option.