^^^Well we aren't talking about superspeed, but about a Speedforce connection. And the Speedforce and its aura seem to block out these points.
^^^^Well your reception becomes a lot slower, like you running in real life and if you run in real life the chance to hit a Wall or a human without noticing is kinda low. The shockwaves aren't a side effect of a Speedforce connection. Only when you have simple superspeed. But if that's the case you could create a black hole which is much worth. Thank God the Speedforce exists in the DC universe lol.