Sure and at the start of every game, we just do the demigod dance.. Our team picks a demigod, your team changes its own to match that, then ours changes to match your change.. and so on.
You realize i hope, how stupidly futile your argument is. In an ideal world, you would have no idea what the enemy will bring in terms of demigods and as such.. you would have to adjust your own selection to cover the boradest spectrum possible in terms of skills.
Now if you can do that, while picking the same demigod twice.. then the game is obviously not well balanced. If you can't, then telling someone not to pick the same demigod his teammate has choosen is actually helping him improve his game.
Do you realize how bad you are at countering somone's arguement? You can't use the justification that because one matchup is bad agaisnt a certain setup, that theres always a direct counter. There is only extremes that this would happen in, and the "perptual demigod dance" you seem to believe has never, and never will happen because of this. That my friend- is a stupidly futile point that is irrelevant.
You realize i hope, how stupidly futile your argument is. In an ideal world, you would have no idea what the enemy will bring in terms of demigods and as such.. you would have to adjust your own selection to cover the boradest spectrum possible in terms of skills.
This is completely irrelevant to the topic at hand, but yes it is my opinion you should not know what the other teams setup is till the game starts as the heros are mostly linear not able to change complete styles of play. DOTA took this model, and it worked well.
Now if you can do that, while picking the same demigod twice.. then the game is obviously not well balanced. If you can't, then telling someone not to pick the same demigod his teammate has choosen is actually helping him improve his game.
Wow, you are REALLY bad at making points that are irrelevant, have I told you that before? Theres no "reason" why two of the same hero cannot be an effective team in a broad spectrum, it has nothing to do with balance. If two of the same hero can be just as effective as two different heros in a situation, it in no way implies that if you took that hero, and another hero that it would come out as OP. Way to fail connecting the dots there.
Even if choosing two demi's is hit or miss, theres reason why you should be restricted to strategies that aren't. Very often games are fundamentally this way, ever heard of rushing in an RTS? It's the players CHOICE to be unique, take risks, or to play it safe. Often playing against the expected is the best way to put your opponent in a situation he doesn't know how to deal with.
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If they do it on both lanes or at their interesection, then your creeps wont get out and u cant really attack their base on your own 
Sure, giants and massive aoe can solve it, but at that time their team already has the advatange (if you survived that long anyway).