After running some encounters at end game and seeing how newer players are getting treated simply because their learning experience leads to the deaths of those who are more experienced, I think it makes sense to have some kind of handicap system in place that gives the newer players a buff based on some kind of metric relative to the more experienced players. So if a new player joins a Titan hardmode group that is "farming" Titan, that player would get a buff since the farm group members likely have more Titan kills than the new player in question.
I mean, it's an idea at least. We already have people being forced to sneak into these runs in party finder (not saying that is a good thing), at least this would help ease the burden on the rest of the group hypothetically.