IMHO, it's not very smart to wear sneakers or sandals.
I never wear them, I've seen too many riders with missing toes or worse.
It's boots all the time for me, even just work boots or hiking boots are way better than sneakers (no ankle support) or sandals (no protection at all), be safe! And, of course, I believe in personal responsibility, so everyone can do what they want and be as smart as they want.

Paved roads, just more needless government spending...

I pick up my mail in Santa Barbara, California, USA.