Think back to when you first started playing. What was the most annoying thing? For me, it was having to wait for my dragons to heal.
When you first start playing a game, that is the time to get hooked. Anything that takes away from play time, like waiting for your dragons to heal for 5 minutes, meant close the app and forget about the game.
Sure, you can forge them, 1 per FIVE hours, or buy them, but usually, when you first try out a new game, you aren’t sure you WANT to spend money on it. You can pretty much make it through the first tier, or two, of dragons in a few hours…but not if you have to wait for dragons to heal.
Seriously, I’d like to see heal times in Red, Purple and Blue tiers reduced to seconds, at most.