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Depends, do you want the in-story answer? Or the Out of Story?
In-story: Since Mikoto decided they could. Personal Reality and all that. If Mikoto thinks her lightning can create a shockwave powerful enough to harm surroundings, it can.
Out of Story: Because it looks cool. Let's face it, what looks stronger? Calling down a huge bolt of lightning with little to no visible damage? Or calling down a huge bolt of lightning and seeing the concrete shatter?
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