Mission tables are good when they get you out, but the reward for going out is not getting more content, but instead getting upgrades for your automated income system. I would love if every mission at the mission table led to something you could do in outside world, encouraging diverse play and maybe even creating cool prologues for some stories, but in the end, when you have completed the very finite quest content from the mission table, you just have a gold mine left, that really ask nothing off you.
I agree, that it would be dumb to complain about dungeons when you have full mythic gear, because dungeons are no longer relevant for you and not worth your time, but that is not the case for the mission table. It gives you alot of free things and those "rewards"/gains from the mission table, stays current for aslong as you play really.
As i tried to tell the dear IAmtheDevil, the gains from the system are so big for such a small amount of work, that it feels very mandatory to do, if you want to have a healthy functioning character, even if it does not really have a positive effect on your gaming experience. The system can be used for good, but it is used for money-grapping and cheating people into not engaging with the actual core gameplay after a while.