I personally think summoner will be harder to play than it is now.

Why?

Because you can choose how you use your summons between your bahamut/phoenix phases.

You need adjust your summons based what you need.
- Some phases need more aoe
- Some phases need more instant casts for mechanics
- some phases need more burst

- For garuda the boss need to be stationary for the dot
- Ifrit phase have long cast times
- Titan have a lot of instant cast, it might be good for movement phase