[henrygrew]

This should be discouraged at a professional level

[esrauch]

The professional level should involve doing whatever the game permits that is most effective.

If it is a viable strategy and not a real edge case to punish some maximal greedy strategy, the game should probably be patched.

[Cthulhu_]

I would expect professionals to be able to deal with it defensively as well. It's a game, if it's possible to do in the game it's legal. And Blizzard has regularly pushed updates / rebalancing in both SC1 and 2 to make certain strategies more or less viable.