BFS (SpaceX's Big Falcon Spaceship) is in development and has seen between 2016 and 2018 three major design modifications.
January 2018 I asked here how BFS planned to manoever during aerobraking.
Latest SpaceX presentation answered this question with this simulation:
Movable control surfaces have been added, canard and fins, which will steer the vehicule during aerobraking, in roughly the same way one skydiver can change its attitude by moving its limbs, providing differential drag around center of gravity. And this looks like a great idea.
Anyway it feels like (unavoidable opinion-biased statement when considering something which doesn't even exist except in simulations) this design could provide one complicated heat shielding of the whole ship (mostly on hinges) and complicated double purpose of aft fins also acting as main landing legs.
Question is: How viable would it be to have (see animation below) one monolithic heat shield protecting hinges, limited amount of movable control surfaces (2 instead of 4) and conventional landing legs (retracted in animation below)
Note that there's one complexity increase in designing rotatable and slidable surfaces, and that those control surfaces could be lighter since they don't need to whistand the weight of the whole ship on the ground)
Also note that yaw control may be assimilated to paper helicopters.
heat shielding concerns :