The director letter gives a clear mechanical explanation about how it works. Whether this new system means less drops overall compared to before, it will entirely depend on how much they boosted the rates for items.
#is it true u get less drops if u run with more people in the party?
little bolt
little bolt
If you’re able to run a dungeon as quickly regardless of how many accompany you, going alone would probably be best with the new rates. However, if your clear speed is slow without other people’s help, it would be worth it bringing 1, 2, or more people with you.