
Originally Posted by
Triceron
Yes, they've done it before. It was called Brood War. All it did was add a couple units to each race, add a couple upgrades and tweak some stats. It took 2+ years to balance right, and it didn't even have exclusive tech trees.
Take the Goliath for example. With just one small upgrade, it was turned from a generally unused, well-rounded unit into the defacto AA specialist. The way you play Terrans in Vanilla is almost completely different from the strategies used in Brood War, and this is due to the addition of the medic and goliath with upgrade.
Making exclusive tech paths is like trying to retrofit SC Vanilla gameplay into Brood War. It's possible to accomplish but you're essentially rebalancing an entire faction within a faction. I don't think you truly understand the scope of what you're asking. Making banelings explode OR giving them acid spore type damage is not something you can address in a patch. These type of changes are on par with adding a new race to the game. SC2 is not War3 where you can just throw around modifiers at will and things will balance out; it's a fine-tuned system with few exclusive variables.
SC1's fine balance was what made competitive gaming so intense. Watching a match between two players came down to pure skill. There were few 'random' factors in the way. Once you add exclusive tech trees with these kind of choices, you make counters unpredictable and strategies unreliable. These exclusive factors conflict with what's already accepted as Starcraft gameplay.