Broadly, I didn't have the issues you describe.
I think some familiarity with DnD 5e goes a lot way here. I felt like all the content in early access was appropriate for the labelled "Normal" difficulty. The idea that you can't form a strategy when there are some unknown elements is a wrong one in my opinion. The first four points frame the game as if it were too difficult but I really encourage you to redouble your efforts.
Lastly, you can in fact unlink all 4 party members. Try again.
