Honestly? I think they quickly realized that the seducer was waaay too sketchy, and people immediately saw it as suspicious, which..well, yea. There's a reason Larian changed the name to "guardian".
A?, in the EA I immediately distrusted the dreamer and thought they were out to eat me, the Guardian in the actual game, there is nuance and you can read it both ways. The Dream partner was just, too the monster using mind control to manipulate you, the monster presenting you with half truths and saying only you can save the world, is a more tempting hook and works better. to me it's 100% an improvement
The big change from the EA I notice is SH, how you can free her now, and how she is unavoidable, not found near the doors of the temple but railroad, in your way, unavoidable, your first post-crash companion. It makes her feel more the protagonist than your character when her stuff comes up later as it frames her as the priority companion when time was, her astaron and gale were all equal chances as the first companion you'd meet post-crash
