Its a very difficult spot for devs. If you increase the amount of raidwide damage you increase the stress on the average healer. However if you make the dps rotation of healer more complex you also put more stress on the average healer due to the current way content is made.

The golden question is how do you increase the role responsibility for all roles without drastically increasing the challenge of content and not making it where one role is significantly harder than another one?

I know in other games they give out more raid wide damage but most classes have self/party mitigation. Then you have the question is square willing to make a drastic change to healing in where it changes the normal of content?