Would be cool if raids had a mode where you could fight in multiple waves of heroes. If one dies the next one in line spawns until you have none left. The same would go for the defending team. That way all our unused heroes could be used more often instead of the same select few. It would make things more interesting I think. Battles would be longer for sure and a lot more strategic planning would be needed ahead of time. It would be like a 15 vs 15 with only 5 heroes at any one time.
Of course, new players only have a few heroes initially but maybe there’s a way to address that.