Idea for boss encounters

I have been thinking about some of the boss strategies in the game lately, and I had an idea for abilities for raid bosses, like for example Deathwing.

Most of the dragonfights we know are pretty much all the same, Flame Breath, Tail Knockback, Whelps, etc etc.. You know what I’m talking about.
All of the fights now are set up in fixed phases, when the boss starts phase 1 begins, then at X% phase 2 starts, etc..But what if Blizzard made a bossfight less predictable? For example, give a boss a range of possible phases that could happen, like 10 different phases and let them happen "at random”. Then when the fight starts no one knows what phase is going to happen first and what phase is next. This way one of the key factors in raids is communication, and learning how to adapt to an unknown situation.
To announce the start of the next phase, an emote could be shown on the screen, indicating what phase could be next.

I think this might be fun and challenging. I’m sure there are flaws in my idea but this could be worked out?

Let me know what you guys think, and thanks for the feedback/info/flaming!