Early Access for games is a more modern invention, which did not exist in the past, it was once praised as a good and innovative thing, but now I think it has more drawbacks than it does good.
What does Early Access do? It grants users an early access to the game before it is finished, so they can get the game before it is actually finished and therefore help develop the game through testing and giving feedback.
Sounds all good at first? So let us break down what is bad with this model: