Ed Kyle writes

That might make sense for a trans-lunar CEV, but it is
way beyond overkill for a LEO/ISS CEV. The vehicle you
describe would provide more than 3,400 meters/sec delta-v.
Apollo CSM only provided 2,804 m/s. Space shuttle orbiters,
on the other hand, only provide about 700 m/s. Soyuz TMA
provides about 390 m/s. Gemini only provided 98 m/s.


Note that Gemini had both manuever engines and solid deorbit rockets. I think
the total was about 300 m/s

Will Mclean