Yeah, we will have to just agree to disagree. I don't think 4th edition failed because of changes to alignment, don't think there would be a problem with BG original story without objective evil, don't think Shar would be bland without objective evil, and don't think BG3 story would suffer in any way without alignment.

Existence of objective good and evil takes away from the setting being serious in my eyes, makes it more goofy, cartoony.