I think missing some contents are part of the game play. A very good feature of BG3 is that no matter how many things you missed, you can always find a path to continue the game and that makes your unique story.
technically it's very easy to make everything highlight making thousands red points on your map, yet it's very precious being confident to hide works, course they know you will play more than once.
therefore, personal I don't support this suggestion.
