Court Of Blades Expert not dropping guranteed adepts is a huge L

Title. Been grinding for about 2-3 hours with my mates getting platinum basically everytime and I can count on one hand how many adepts I got, it was about 3. My friend got 0 and my other mate got 2.

I don’t understand the design choice behind making a more difficult activity, which when getting up to about 10ish combatant kills becomes quite hard, does not gurantee the drop people play it for?

This could purely be cope, sure, but the grind is abysmal compared to the nether basically handing you loot for being there.