I'd consider WHM as less of a "Pure Healer" and more of a "Raw Healer" with a toolkit just designed to exude raw heals and raw DPS. Having both the highest DPS and HPS throughput of all the healers with little frills attached means they're there to piston out as much of anything as possible to help complete the duty. I do agree that this puts WHM in particular in an odd situation because depending on the fight that means they'll be using one half of their kit more often than the other with little synergy in between to mesh the two halves together. A couple of QoLs can fix that really quickly though.

I will agree with the sentiment stated early - I'm pretty certain S-E has no damn clue what they're doing with healers at this point. To me this is less of a WHM issue and more of a "healer identity and/or design" issue overall.