in general... why don't protoss players use warp prisms... i mean those things are some of the handiest tools protoss has for mid - game harass.
I watch a LOT of games... but very rarely will a protoss use that prism to, for example, drop zealots at the natural before warping in another few in the main.
I mean its still important to be sure you're trading evenly, but mid game economic damage to a zerg can be vital. Especially if its forcing a round of drones before you move out.
Noted - some protoss do you use them... but they're not common.
Protoss players dont use warp prism because of 4 reasons
1. Robo facility is normally used for making collosus and u dont have the spare time of making warp prism.
2. A proxy pylon can do a similar job for 100 minerals
3. Most importantly, protoss have no stimmed marines / marauders that have high dps that can do enough damage to the opponent for their cost.
4. Warp prism are so slow that it cant escape in time.
Back to the topic, you shouldnt have the wrong composition if you scouts him constantly. If he is going ling/muta, you should be able to know when u notice that he doesnt have roaches. You should be able to change your composition.
About coming back, it is possible to come back with a collosus/gateway composition. Just suicide ur zealots to his 3rd/4th while warping in tons of stalkers to counter the mutas. Get blink ASAP.
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