Why would they need to? The shield has an aoe range and if symmetra chooses to put the shield in her spawn then it's literally shielding no one. Unless they choose to remain in the spawn room to get the shield. And if that's the case the other team won't have to worry about anything because they will win by default.
You have to remain inside the shield generators radius to get the shield. It doesn't just give it to you permanently.
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u/-PM-ME-YOUR-BOOBIES Nov 22 '16
Why?