
Originally Posted by
TheRabidDeer
I want to elaborate a little on this. Protoss is a race that just has fewer units and are either specialized or very general. The core army of a protoss (sentry/stalker/zealot) is very generic with no really strong damage dealers. Zealots do quite a bit of damage, but they end up soaking damage more than anything. Stalkers dont do much damage, but they are ranged and cheap to get and are one of the few ground units protoss has that can hit air (to handle banshees, vikings, corruptors or mutalisks), so they are vital too. Sentries dont deal much damage but are great support units. Put those three together and you have a core that works great against armies in small numbers.
However, once you get to the large numbers of hydras/roaches/marines/marauders, where your zealots arent able to do anything before dying, your damage output drops while theirs is steadily increasing. So, you need to deal heavy area damage with a select few units and let your core do more soaking than damage dealing.
There are things that do "OK" for a while... charge lets zealots get a little damage in before dying and blink lets you keep stalkers alive as long as you possibly can, but in general you are taking more damage than you are dealing. Area damage is just a necessary thing to make up for that fact. If protoss had no area damage, they would get destroyed every game that went beyond like 12 minutes if the other player defensively 2 based then attacked with a huge army.