4E had skill challenges and I do miss them.
The idea was there was a series of rolls needed and you have to get like 3 successes before you had 3 failures. The number of success / failures could be varied to adjust just how difficult a skill challenge is.
I would love them to adjust these to be you get x number of failures before you failure the whole task.
This would make it also easier to include teammates and decrease dependence on certain proficiencys to solve problems, by broadening the applicable skill-checks.
An issue that's much more relevant, when you have multiple players controlling different characters. Their aid/inclusion could really drive the group experience in conversations. Larian has here a very good opportunity to push mulitplayer to the next level.
