I haven't been part of the early access, so I don't really know how much my opinion is worth, but I think this is pretty standard. As someone said DOS early access made the same thing, D&Dnext made the same thing then it transitioned to 5e and I guess oneD&D will do the same thing when it will transition to 5e (2024). The early access is there to test the most controversial ideas, or maybe those that puts doubts on the developers themselves, but other than that there is an amount of stuff that they already know they want and how they will implement them.
Larian early access is not like others early access where you have a demo (or a full game) to test, that is increased bit by bit until you have the full game in your hands. You are testing ideas that can be scrapped or changed in any moment.
