How can tanking and healing be made more broadly useful in more "role-specific" ways?

[Sebazy]

After dying half a dozen times in the 24 player raid due to healers doing dps over healing the MT (me) I would like to propose a health based dps buff / debuff for healer dps.

This would absolutely kill 24 mans for me. I've got 97-99% logs in Rabanastre and I can confidently say I've never let a tank die that didn't get themselves killed via failing one of the few mechanics that can actually kill a tank there. However, it's pretty much standard faire for me to have one or two DPS in the party that get themselves one shot the moment Hashmal and co so much as look at them. Do you realise how frustrating it would be for my performance to be tethered to their (in)ability to even stay alive through simple mechanics?

No thank you =(