Greetings,

The development team is aware that the benefits for defeating regular monsters in high level dungeons are not proportionate to the effort. They are also aware that dungeon runs can also be filled with players with conflicting goals (like enjoying the story versus doing a farming/speed run) that leads to it being difficult to enjoy the content. They feel that improvements in these areas are needed and are currently working on countermeasures for this.

We will be sure to fill you in on the details in the near future.