Your lack of seeing spacecraft touch down under rocket power on earth does not prove anything. Except again you don't know what you are talking about. To have a spacecraft do that, you need:
Much more rocket power, because of gravity is greater.
Much more computing power, because of atmosphere and wind.
Much more fuel, because gravity is greater - and rocket power is greater.
Much bigger fueltanks because - you guessed it - gravity is greater.
Much more rocket power because more fuel needs to be carried.
Much more rocket power because bigger fuel tanks are heavier.
Much bigger fuel tanks because much more fuel is heavier.
Kind of bites it's own tail, doesn't it?
Not to mention the need for external aerodynamic cladding and movable surfaces to steer with. More mass, more rocket power, more fuel, more mass, more rocket power, more fuel, more ........
Landing a rocketpowered craft from orbital velocity or extra-orbital velocity (as a moon return trajectory) won't be possible.
Face it: Landing using only rocket power is only possible on an airless body. Like the moon. Even the mars missions use heatshields and parachutes to dump the energy before powered landing.