well. outposts can relocate/rebuild/defend themselves
Its a shame that atmospheric landings were not the introduction to planetary landings in a way.
Exploring specifically - the planets where you can land aren't generally the planets explorers pay much attention to as they are terribly unprofitable. Perhaps PL and the surface exploration involved with that will change things a little.
Yep. I haven't done much exploration myself, but even I know that after doing the initial honk if a planet looks like a bluish white ball you shouldn't waste any time on it. After Horizons I'll probably go over anyway just to admire it.
Just want to point out that we don't know all the details of what we could come across down on these planets yet in terms of gameplay and valuable "stuff"...so making assumptions about that they are "not worth it" is a tad bit early IMO.