That seems dangerous when riding a bike through a busy city. I intentionally wear these regular earbuds that don't seal your ear airtight. I don't like the feeling of having one of my senses completely cut off, especially when participating in traffic. That seems like a big security risk.

I have this exact experience. To hear music on some busy streets, I have to turn the volume up to unhealthy levels (I stop listening at that point).

... How many hours have you spent here on earth ? Adaptative senses is a nifty feature which allows you to see better in the dark, listen in on quiet conversations, feel the texture of stuff and all of that only when it matters.