Are you worried about getting front run for fractions of a cent? I’m not. I’d rather have penny wide spreads instead of 1/8 dollar (or larger) like the old minimum tick size.

Dark pools reduce volatility, it’s just liquidity outside of the normal order book. Regular people don’t need dark pools because they aren’t slinging $500M block trades. Furthermore, trades can happen off-exchange without dark pools.

It sounds like you aren’t even an amateur, let alone an expert, no offense.