One big negative was the mission lidar was (so far claimed) launched with the manual ground safety override in place so it could not function at all. I don't know if this merely blocked the laser beam from escaping or left it so it could not be powered. It was to prevent eye damage to technicians during checkout procedures. There was an experiment on board that also had a lidar system which they wrote a hack to communicate between the landing software and the experiment. A small amount of money on the chance the experiment lidar wasn't aimed in quite the same way and the landing software patch didn't make up the difference.
Surprising was the defect was noted only because someone apparently was curious to see what the readings were 2 hours before the mission lidar was needed. That made for a really short patch window.
There have been proposals to put up a navigation satellite constellation around the moon like the GPS or Galileo systems. This would have greatly aided the detection and cancellation of the sideways movement during landing. It might not require more than 4 or 5 satellites to do so as the landing could be specifically timed for when the nav satellites were visible. I think there is also a need for one ground station to calibrate the orbital information.