The funny thing about pure healers is that they can be one anytime. Just remove your damaging abilities from your hotbar and there you go, now they can heal each other with glitter magic until everyones bottom turns into solid gold (or attempt doing so before the servers go down for the next maintenance)

But jokes aside, i guess we will be waiting for quite a while (and if you're asking me, probably in vain too) before we get proper changes for healers (and tanks too) which aren't about making things even more simple as they already are.