Expansion Ideas: Systems, Features, and Content Types - What would you add?

[Shurrikhan]

The rotation are always the same for each class. I would love to see a change in the skill tree system.
It would be interesting if SE could add the role actions element into the job skills where player can only pick a certain ultimate skills into battle
so player could customize their rotation and change the play style from time to time.
You could say something like diablo 3 or maybe like Heroes of the storm where player can pick only
one of the 2 ultimate at level 10 and traits are customizable.
For example:
1. SMN: summon/Dots build
2. MCH: turrets/gun build
3. BRD: bow/support build
etc. etc.

Just playing Devil's Advocate here:

But, would you like to be forced to play a particular one of multiple different ways depending entirely on the fight, rather than merely altering your opener and near-jump CDs? Generally, that's what external and fully player-controlled customization comes down to: particular fights quite nearly require particular setups, at least once the community comes to know (or, believe) they are optimal.