EliteSniper wrote: 
That's a good way to get fans.

Yes and leaving 4v4 6k HH games popping everywhere is also a
fantastic way to ensure a newbie becomes a fan !
So let me be comprehensive here on why restrictions are a good idea :
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helps not to fraction community by adding additional optionsI don't know for you, but I've clocked more than 600 hours in WEE and WAB combined and I still manage to participate into games I didn't even check the settings. And then I discover mid-match that I got into one of those awful (IMHO) total destruction no time limit games or that the game is going to end in 5 minutes and I didn't push hard enough. Point is, it's still hard to be absolutely sure that you participate in a game you like. By adding more options, especially ones which are notorious to polarize people (love it/hate it), you're going to make the community life that much harder. And not fractioning the community is one of the most important thing for the devs : that's why you don't have mod tools, that's why you have free DLC, etc...
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helps newbiesOh sure, games with exotic requirement might be very fun if played between people who know exactly what they are doing. Hey, after all it's true for everything: if that rocks your boat and you do it between consenting adults, I have nothing to say about your kinky habits.
But sadly here you can't guarantee that. Right now there's no option to artificially separate public and private game options so forget about it. If you authorize exotic games then you'll expose the entire audience of WAB to it and you're definitely NOT going to give a good image of it. It's like giving to pre-teen an introductory course about sexuality and dwelling into BDSM. NOT A GOOD IDEA.
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makes sure everyone is on the same pageIt was said several times here already, but the dev have a very strong and precise idea on how the game should be played. They are pretty much entitled to that, you can't really do anything about it.
So imagine you're a toy maker and you spend 6 months crafting this wonderful and complicated transforming toy. You give it to two kids who are playing on the street to test their reaction and they begin to use it as a shovel for dirt. I don't know for you, but I would begin to have very strong urges to bang their head together. Quite vehemently at that.
It's pretty much the same here. The dev crafted a gem of a game, which has depth and strategy and so on, and some want to waste it by cramming as much units as they can into maps and pressing fast move. It kinda hurts my soul just thinking about it. Anyhow, devs want everybody to play the game the way they wanted the game to be played, and I sure as hell can't fault them about that.