They want to carry 100 people. An escape system for those many people is the same scale of a commercial airliner escape system, which is designed to be operated on a stationary plane, on land or water. Astronauts will be well trained to use it but I think that there must be a lot of openings to let 100 people get out quickly in mid air. Maybe they'll agree that Starship is its own escape system.

There is a section about Space Shuttle's crew bailout at https://en.wikipedia.org/wiki/Space_Shuttle_abort_modes

Before the "Ejection escape systems" there are a few paragraphs about "inflight crew escape system"

> The vehicle was put in a stable glide on autopilot, the hatch was blown, and the crew slid out a pole to clear the orbiter's left wing. They would then parachute to earth or the sea

But 100 people is a different matter IMHO.

Ejections seats and capsule were not pursued, the Wikipedia page explains the reasons.