This is a mmorpg, so it makes sense for players to have a need for others to achieve things in the game, otherwise we would be playing a survival singleplayer which is not what DU wants to be, nor was ever marketed as such.
"Large organizations will have an advantage"... I've heard this so many times, and again it's a baseless claim. The economy has and will have producers of different sizes, from the solo player to the largest organization. An organization with 100 players may end up producing 100 different elements earning 100 mlns, the solo player will simply produce 1 element earning 1 mln, which makes sense since the reward/player ratio is the same. You don't have to produce everything to compete as a producer, nor you're alone against the large organizations since there'll be plenty of other solo players/small orgs participating in the economy, trading and supporting each other.
Specialized roles and a working economy will benefit the game greatly, making it more likely for players to play the way they want, since now we start needing each other for production so we effectively pay people to produce elements for us, instead of building industries for self production. One day we'll see other parts of the game require more specialization and it won't be that easy for a miner to pilot a large cargo ship, nor it will be easy for a pilot to use a weapon: we'll need each other and be willing to pay them to do a specific job that we can't do. At that point we'll see new kinds of jobs rise naturally (bounty hunter, miner, hauler, ... ), which is part of what being a sandbox means.
DU isn't just a building game for creators, NQ wants to create an actual society that in a way works as a self-sufficient ecosystem, and it relies around the equilibrium between all parts and entities that take part in it. This change is one of the first that goes in that direction.