So about Summoner...

[Wayfinder3]

For prog you want to hold swiftcast, but post prog we'd use swiftcast for optimizing things. Vercure is pretty useless post prog, but during prog if a healer is late on a heal (or dead) and someone just needs an emergency heal, Vercure can be extremely useful (I used it multiple times the few lockouts I played RDM in UWU). I can lose a gcd to keep someone alive in prog or let them die and potentially wipe for it. Easy choice

Agreed, prog is the most important thing here. it's no suprise that rdm loses it's value after prog as time goes on. you don't keep your training wheels on after you've learned to ride. You also no longer crawl, once you've learned to walk. RDM is worse out of progression by that logic and no highly skilled player can argue that