Why is healing so miserabl;e?

and most of time its more then enough IF people use their personal and group wide defensives prior to dmg ongoing not after they get hit for like 80 % of their health and only then they panic press defensive.

hell i very often miss this or press them to late - but i dont pretend that its the issue with dungeon - its the issue with me not using it fast enough .

most people are openly dishonest about what is happening in m+ and thats truth.