Even though Early Access can be an incredible thing to allow developers to build up their game with the community, and pull in some early funds, it can also go very wrong. And now Valve are making it a bit clearer for you if a game hasn't been updated.
Similarly, Factorio was basically a full game for over a year before the v1.0.0 launch, but the devs didn’t feel like it was finished enough to actually launch. People had literal tens of thousands of hours on it before it even hit launch day.