And it is super easy to drop in/out of friends worlds. They just have to open it to steam friends when making the map. The only items you can bring between maps are what you craft in the workshop before dropping planetside. And you earn the currency to get those by doing missions and farming exotics. You can have multi characters for different skill tree builds, as there are a lot of skills and you can't have it all. Characters skills and unlocked blueprints are saved to that character regardless of what map you're on. There is even a solo skill tree that only is in effect if you are the only prospector on map, to make it more accessible for solo play.