Theres not such meta, i have to dps as a healer, stop fooling yourself. Even 7man a3s are out there, showing that there's room to wiggle around in terms of "skill" or whatever you want to describe it. Theres no obligation to dps as a mainhealer in the first place exept for the opener. Theres a simple trinity to tell you that.

Healing-Healing DPS-Tank DPS

If your tanks dps, you need more heal and lose healing dps.
If your healers dps, you need migration and lose tank dps.
If your healers heal, your tank dps must go up.
4th: your dps are godly enough to compensate for the statement above or are so bad that you need more of the above.

Basically either you doing stuff wrong are you need to get gud. The "meta" healers must dps will not apply at all if your tanks are dpshungry, which is imo way better anyways, unless the cross the line they shouldn't cross and reach toward the white light at the end of the tunnel.