[cryptonector]

Starship separation from booster could be the launch abort system. There is no landing abort system.

My concern is that the flip maneuver is just too risky for landing with people on board even if Starship manages to do 200 perfect landings in a row (that would be a better record than the Shuttle).

[cubefox]

I guess one factor which makes it less bad is that Starship can throttle its engines to hover (Falcon 9 can only throttle them down completely in a "suicide burn", which leaves no possibility of hovering in place). Starship also uses multiple engines for the landing. So if one fails, it still has a few others left, and perhaps even enough time to start another one.