Indeed, missiles use small fins to achieve high g turning, but for Earth to Earth flights, the issue of fuel saving ( and safety back up procedures )...
It is mostly vertical falling in these tests; lift generated by the flaps is used mainly for attitude stabilisation. Think of it as a skydiver using...
Dry roasted, unsalted peanuts for my afternoon snack. I'm trying to be good, I really am, but every time I'm in a store I'm SO tempted to grab a bag...