Well, bk has awoken at lvl7 now, no difference felt. The chill thing about TH8 is that you can choose not to focus on heroes, farm a little DE and yet still max your hero. That’s why maxers are lulled to think that they can choose not to focus on heroes in TH9 and then regret that.
I strongly believe that one should be thrown into a stressful situation so that one can grow the best. Stress is one of the strongest motivators and when you rush, you inadvertently do that so you grow a lot.