Makes sense, but too harsh IMO. The quest mobs aren't generally weak con mobs who hit less hard and die much quicker. Largerly there is nothing different about them except for the fact they happen to be quest mobs. As such lowering the XP to offset their fast respawn is OK, but maybe by 25-50%, not a huge amount.
Yep CotF HA's already gave sizeable amounts on hails (5-6AA often) before the change, while TDS give almost nothing. It's clearly a concious choice to move more from quest bonus XP to mob XP in TDS, which is just saving up a problem for the next expansion given they had to move in the opposite direction in CotF. The logical approach here would have simply to make TDS HA kill XP marginally lower (not HUGE, but it was always felt a bit out of whack compared to the static zones) and cap the auto-level adjust at level 100. Maybe they just don't have code support to set caps on different HAs.
