I may not aggree with you.
In PvP: If tank about to die and dps get Light Prison, should heal > dispel
In PvE: If 1 partner about to die and the other get Polymorph, heal > dispel
That also the reason I made 2 dispel on separate priority: Dispel ASAP and Dispel when no one need heal.
Tslong better dispell debuff that heal dragon
Final boss os HoF better dispel in 3 phase that heal raid whit low healt..
I have more examples...
I only speak about PVE