Still going to have margins of error with both the measurements and the corrections, right? If those margins are higher than what the Moon forgives…
On a body with atmosphere you can essentially just drop a payload up to some maximum size with a proper heat shield and a parashute and it will end up (somewhere) on the surface in one piece.
On an atmosphere less body you essentially need to run precisely controlled flight all the way to touchdown.
Everything has tradeoffs. :-P
Given the Mars gravity I still wonder if no atmosphere would still make it worse vs the thin that it has.
Engines are well understood. With enough propellant one can gently hover down at 1 cm/s from 1km. No atmosphere also means few surprises.
A celestial body with no atmosphere: Extremely easy to take off from, but very hard to actually land.