Yeah should be pretty tough even on Risk 18 let alone max. At least my Bibeak will have lots to do in Lead Seal.
I see. That seems about in line with what I've seen for the similar game I played, although combos went up even more for stages on Spectre difficulty. Co-op was so bad in it that I only ever used it for celebratory prize unit stages that required no actual cooperation. The buffs vary in usefulness but this recent batch of them has helped out older units considerably and many of them stand on par with new ones. One of those things where "can't nerf because it's gacha, so just make everyone else powerful too" in the end.
'night, it's hot here too wtf, it wasn't this way last night. I'll turn on my standing fan in honour of Lens, who I forgot was that large.