re: Is it just me?
The reason for not landing on an asteroid is because it could be a loose rubble asteroid and the rocket could break up the asteroid and send many debris in unwanted directions which you would then have to deal with several threats that would be uncontrollable.
They even designed the rocket nozzles at an angle to avoid disturbing the surface of the asteroid.
The problem I see is this design matches a 20 ton rocket for a 200 meter wide asteroid.
Do we have a big enough rocket for a mile wide asteroid?