If you will also recall, when he tried to explain himself, and even before he did, the other three commentators kept slamming him before he could even get out a complete sentence. If he did have a reason, they all went full-on
YoshiP and decided that he shouldn't have it before he even gave it, which, for many people, is demoralizing enough to stop the outlier from expressing their thoughts when groupthinkers try to eat them alive.
Meanwhile, that like: the very first question, I guess, is their official stance. And it's exactly what I thought it was going to be.
"wait for savage content, then we'll think about listening to you"
If you're concerned about optimization, you would wait for the opportunity to weave in certain spells/skills/abilities between recast times, while trying to avoid clipping into those recast times.
In this case, from what others have presented, the optimal use seems to be to wait until WHM has Assize to weave between lily heal usage, which means that they could be waiting a while to use them depending on the scenario.