Now I'll start by saying that there is plenty of XP in the game. Without a single XP pot you can easily cap doing all quests one and done on Elite and Epic Elite.
So this proposal which has come up a few times isn't to fix the problem of XP. It is however intended to help address the XP/min for those that want to explore every nook and cranny of a full dungeon.
Prompted by the discussion on why we have breakable bonusses, I'd like to offer an additional "Bonus Completion" reward at the end of a quest for those parties that took the time to kill their way to Conquest, smash their way to Ransack, disable their way to Ingenious, search their way to Vigilant on a Persistent run. I would include without deaths, but only on the condition that Death Penalties are personal and not party wide as we currently have to endure.
Hand-in-hand with this would be a tweak to any dungeon where you smash every breakable, kill every mob, do every trap, secret etc and are not awarded the maximum bonus. Stupidly low XP Optionals should also have their XP boosted to make them worth the time, again I can provide a full list, no need for devs to spend weeks researching these.
Insidious Cunning bonus would count in the same way as Conquest and should award the same 25% XP bonus. While not every quest will be stealthable, I'd happily see some quests revisited and tweaked so they can be.
I'm in two minds whether this additional bonus should be a first-time bonus or not, either way is fine for me.
The "Bonus Completion" award would be an additional 10% bonus added to the existing (XP POT + Guild + VOM + VIP + Completion) bonus, so potentially 50% + 5% + 5% + 10% + 10%.
Obviously the people who will benefit the most from this are those who want to spend some time enjoying the dungeons, which may be mostly new players. It may or may not encourage grouping if people have another reason on top of the 30% Ingenious bonus to tentatively welcome the low HP rogue death-magnet to the party. Either way, those that never pug won't care so it won't disadvantage them.
It's not anti-zerger, as those that zerg already tell us the game is too easy and their XP/min isn't worth any distractions - including those who won't stop to open a chest never mind watch a trap being disabled or swing at a breakable. They don't care, so this is irrelevant to them.
Not the first time this has been mentioned. I suspect it won't be the last. The dev schedule is already set for the next couple of updates so even if this was welcomed by Sev and Co. it wouldn't happen soon. The reason I think this is worth bringing up again, is that there's a hint of a change of direction with Sev now officially at the helm and old decisions like "no more Monster Manual volumes" are rumoured to be reversed.