Doing any open world content as a healer is unberable

Look I think healers need a tiny damage buff, I was playing healer in open world as Disc Priest (One of the more damagy healers) min maxxed my build for damage and doing anything in open world was just awful, they should start increasing the healer damage just a bit and changing specs is bad cause I want to get used to my skills as healer while I play in the open world, experiment builds etc…

I dont know why the damage have to be that low, I understand they having low damage, but If I do a build for open world content and focus only in doing damage I should deal at least in >single target< a similar damage to a tank (In open world of course)

Edit: Look You cant have a Expansion based class and by consequence spec identity if the cool weapon that was given to you dont work in half of the content, Even in the priest class hall quest lines u have to kill 50 demons, one Mission before you are told how great your weapon is than one mission after you have to change your whole character identity because you cant do basic content

If you dont make this spec viable in the open world you are gatekeeping all the new players from playing the spec, Besides blizzard should warn you about it. “Cool weapon you got there now forget your questline and let me present to you to dungeon finder “