In the option example no routing choice would help you get filled. That option is 7 cents wide so the theo would be 1.815. Had you bid 1.81 initially the order would've probably gone to the market as a cross (market maker sends the order to the exchange and takes the other side) which would have...
To your point about options routing, there are 15 equity options exchanges in the U.S. and most equity options trade on all 15. When Reg-NMS came around (early 2000s) options exchanges are obligated to route or manage your order to the away best price. Prior to that each option exchange had...
Does anyone know why futures products (for the most part) only trade on one exchange?
Don't get me wrong, I think there are definitely a lot of pros to this more simple structure, but think there are some cons as well.