I'm coming back after a year and am making probably what is my 24th character, I've leveled 23 to 50 and deleted a few along the way. I have quite a bit of end game experience (a few trifectes etc) so I'm aware of the desire to run dungeons quickly when it comes to random normals.

On the other hand when you have a 2k CP player who enters a random normal and SPRINTS through everything with three sub 50 players in the group, some likely new it just feels lopsided. First of all the quest givers cannot be talked to when in combat. I was just in an Arx Corinum specifically to do the quest on my newer character. The 2200 cp person sprinted past the first boss to the 2nd boss. I wasn't able to pickup the quest due to combat. Well after I called them out on it we back-cleared to the quest giver but the next step is to kill the boss we already killed.

So for anyone who isn't aware of exactly how combat stages work this is my understanding of it and it becomes apparent if you get an addon like Bandits UI which shows your combat stage by color.
Sage 1 combat is a white reticle in bandits UI, this means you are completely out of combat.
Stage 2 combat is when you are in combat but not fully engaged, this is signified by a white reticle. You can't do stuff like change gear or skills but you can talk to NPCs and go through doors. This is when someone in your group gets into combat but you haven't taken or delt damage.
Stage 3 combat is when you have taken or delt damage, this is a red reticle with bandit's UI. You are fully in combat. You cannot change skills, gear, cp, talk to NPCS or open doors.

With that explained I have two possible solutions to this. One would simply be to make it so that talking to NPCs is possible even after you are in stage 3 combat. The second solution which I think should happen anyways would be to change all the base game dungeon quests to be like the DLC quests. The DLC quests just require you to pick up the quest then kill the last boss. The base game quests have a TON of roleplay elements. Its so bad that I have almost every dungeon quest's stages memorized on what you can skip and what you MUST do. The worst offender is probably Vaults of Madness, there's just a ton of dialogue and if you don't have addons you might not know you must wait at certain spots for them to talk about their life before the quest icon even appears over their head.

For vet players this is just an annoyance. I imagine though, for new players this is probably extremely annoying to deal with.