If RNG is dictating the tasks, it should be relatively simple to code in some logic that prevents both the Adventure Board and Dungeon tasks (and any other tasks requiring multiple days) from appearing during the same week. I don’t mind one of them appearing in a given week, but when both appear in the same week it can be really easy to accidentally lock yourself out of completing the campaign tasks and fall behind unless you pay crystals. Especially when it happens during the last week of the campaign and you cannot catch up the following week. I doubt most of the player base is looking at the full campaign task list at the start of each week, so many players will inevitably fall a day or two behind because they completed a Dungeon/Adventure Board before the campaign task appeared.
I know this will sound unbelievable to most of the forum regulars, but let’s say someone on this last campaign week fell behind and is trying to catch up from, say, week 7. It’s literally impossible for them to complete all the tasks unless they pay crystals to skip a few Adventure Board or Dungeon tasks.