Duty Roulette - Expert pool is too small

[Nicobo]

In addition, once there were many complaints everytime getting ARF, and very soon everyone just complaining why it is not ARF! ^^;

[Altena]

In addition, once there were many complaints everytime getting ARF, and very soon everyone just complaining why it is not ARF! ^^;

That is a completely different reason....... And would not happen in the case of the DR-Ex dungeons at all after the first few weeks..

It is because ARF is the most efficient Lore grind you can do - as the lore reward was incredibly high compared to other Lv 60 dungeons as the others dropped gear and ARF didn't. Considering the previous few steps have required bucket loads of Lore - that's all people who manually picked a lv60 DR dungeon would pick, hence why DR-60 would always be ARF.

Just keeping the previous 2-4 dungeons in DR-Ex would not favour the old over the new, in fact the exact opposite would likely happen the first few weeks.
People need to complete the new DR-Ex dungeons by queuing in manually before they can do DR-Ex, which would increase the chance that you would get the new dungeons.

Once most people have unlocked DR-Ex is when you would start to get the older dungeons back which would reduce the monotony of spamming the same 2 dungeons for months, every 2nd day. You would likely not get any favouritism between the 4-6 dungeons in the pool over time as there is no real reason to do them outside of DR-Ex.