The decisions are there to be made, but they require some thought and planning. If you're just constantly reacting to deficits in your economy rather than making a plan then I guess it could feel the way it does to you. You definitely can specialise planets without having them fall apart, but it again, it requires planning. The old system only ever felt like it was giving you freedom because it was simplistic and boring. Just get as much stuff as you can, and once you have lots do whatever you like. Making an entire science planet because you feel like it is not strategy. Figuring out which planet is going to be suitable to be a research planet, then figuring out how to make it be one, and also whether it's actually a good idea in the first place - that involves strategy, planning, and thoughtfulness. The freedom is there as are the decisions (and those decisions are actually meaningful now) but you have to make the effort and think through what you're doing rather than just build mines everywhere.
I'd argue that he is in fact correct about his "falling apart" comment when you stop looking at the economy in a vacum (even though it is a space game, ho ho), but look at the broader picture where you are playing a game where planets can shift ownership by conquest.
I know the AI sucks at the moment and thus it is harder to get a 'feel' for it, but the old wording about putting eggs in a basket still stands. If the economy is interdependent on specific planets being in your empire, then each of those planets became a point of failure for your entire empire.
Not to mention that taking/occupying a planet during war from an opponent empire can also have a huge effect on your economy if it drains resources you are already stretched on.