I think the main thing is that there hasn't been anything that needs a high degree of customization, outside of speed to get 3 medals. Currently, raid bosses aren't something that we usually need (or want) to nuke as hard as we can and 12-5 has been pretty much the top level of content, with maybe some of the more recent event ?-8 maps being harder(?). As it stands, my helper squad can make it to the final boss of 12-5 and either kill it or weaken it if I'm playing on auto run, or solo clear 12-5, usually without any unit even dying, if I'm actually playing and using solar blast appropriately. The other teams don't need to do anything other than pick stuff up and keep solar blast strong, so it doesn't really matter what's in them besides high total power.