Please give us back the extra illuvial slots for the drone. 8 illuvials gives you really limited options for a team selection for stage 3 runs. This, coupled with the fewer sightings of rare illuvials and the doubling of encounter cost makes the overall experience a lot more frustrating.
It's OK to see rare illuvials fewer times, but now even if you shoot it, you often have to give up the fight after you scan because there is no way to beat the encounter. It does not matter which 8 illuvials I put in my team if I'm up against 10, 7 of which are stage 3s. (just happened) And if they happen to counter my team (if I want any kind of synergy I can at maximum select 2 affinities for my team), they don't even need to be that strong to decimate me.
(EDIT) It must have been a bad stretch when I wrote this so I take back my comments about the encounter strength. I would still like to have the larger roster back for training and variety. Not to mention the crafting for those drone chips.
There is also no strategy involved now, you just cram the same 7-8 illuvials on the board and hope you can beat the other team.