Trickster said:
Yes, and as we do that we also establish the reason why other races don't "have" to use stationary defensive buildings.
Are you suggesting that protoss must build defensive structures in order to expand? The following is some thoughts based on this assumption:
Currently the roach/ling allin vs 3 gate sentry expand is very strong in the metagame. Because of this, protoss players are 'forced' to make a forge + cannon in order to defend against this. This is because a handful of zealots + mostly sentries are not enough to handle this push. I would relate this to zerg getting caught with their pants down by a 4-gate. So as a protoss player what are the ways I can do to prevent me from "having" to put down the forge:
Early pressure before ling speed is done in order to delay the attack? I dont know if this works very well. In the IPL my protoss opponent opened up with 2 zealots and a stalker to put early pressure on me, forcing units and delaying any all-in I would do against this. Yes this might delay your expansion as well but I imagine it would equalize since you forced early units and now your expansion is safe thanks to some decent fighting units.
Alternativley, how about adding a couple non-sentry units if you suspect the attack coming. The reason why it is so weak against the attack is because sentries are more or less worthless as fighting units on their own. Additional stalkers/zealots could make up for this. Of course, this means more minerals and less gas, maybe this would be a good approach if you are going down a tech path sooner.
I have no idea if these actually work or not, just some ideas that I have floating around. Now, if you 'have' to get your forge I dont see this as a very big downfall. Doing the 3-gate sentry expand is fairly greedy on maps like xel'naga with wide open naturals. Its dangerous for the exact same reason why you dont see many zergs doing fast expansions on these maps. Ive seen toss's getting away with the same build on maps like Shattered temple where they do not 'have' to get a forge in order to be well defended.
Anyways, im sure this is way too theoretical and useless to most of you people (casual gaf). If we cant come up with any decent reasoning behind this forge argument then it is not even worth discussing. I might as well say something like zerg HAS to get a spawning pool to fast expand vs protoss.