I don't have my copy of Decadence yet, so I'm obviously reserving judgment, but I'm afraid it'll ask so much of my time to grind that I'll just... not play it in the end
It's... well, you can auto battle at least! It has the same sort of appeal as most gacha: grinding to get pulls to pull your faves. There's the plus of seeing characters who wouldn't normally interact interacting..
Develop character > tower > pull