Can the DJI Mavic Pro land if it gets dark by RTH ? Thanks

Yes. It uses GPS to return to the home point. That works even when the light is poor. Just make sure you take off from a clear area in case the Mavic lands several feet from the original takeoff point.

It may take a harder landing due to no obstacle avoidance if it's too dark. Can be solved with a god flashlight pointed at the landing zone.

Hi there, thank you for reaching out. Regarding your question as long as you record properly the Homepoint there should be no problem when initiating the RTH feature.

If you are flying after dark, one you should have anti collision lights on the bird, and two, a really good LED flashlight to light the landing area.  Be sure you have your RTH set at a good altitude prior to take off (too clear trees as an example).

Yes it does. I only sometimes have issues with the obstacle avoidance and have to shut it down. If I don't do that the MP sometimes refuses to RTH.