I'm too is against Steam early access.
The first time I saw a game advertising Steam Early access, I thought it was a game that was finished, and that announced a launched date already, but want to release it sooner.
I'm sure many people would think something similar, and even if they read that there are bugs, features not there, they would expect something 99% finished.
Releasing Divinity Original Sin in an unfinished state with Steam early access would, I think, give bad press to Larian studios, and will make it harder to sell the next Larian games.
Consider Larian Studios is not a well known studios. People will try to get comments before buying the game, and see bad comments because of people deceived by an unfinished game would make them not seek deeper information.
Consider the last Simcity. They are soon making it possible to play offline. Would that make come again the customers who didn't buy the game because of that? I think that not, and that these people would not buy future Simcity games.