You do realize that WHMs don't hold Assize for healing because it doesn't have a 2nd charge and letting it sit unused is too much of a dps and MP loss, right?
Assize is a multipurpose skill that is also the most unflexible at the same time.
If you constantly forget that Lilies even exist, I suspect you're not running content where the toolkit of any class matters one bit or where you'd notice a lack of QoL. Because WHM doesn't have "bloated ogCDs" - they have exactly two for aoe healing: Asylum and Assize, the latter being extremely unflexible. And no, PI doesn't count as aoe healing in itself because it buffs GCD heals and you said yourself you tend to forget Lilies even exist.
Assize having a 2nd charge wouldn't solve every problem WHM ever had but what it would do is:
- give the option to hold a charge for healing instead of mindlessly keeping it on cooldown like a clockwork
- dump two charges in burst windows/ big pulls if healing isn't necessary for big burst dps
- hold one charge to align with raid buffs
- hold one charge to align with add phases
- give the option to hold one charge for MP on demand because if a WHM died when LD/ Assize is on CD, they'll be thoroughly screwed with the new Thin Air
- hold it during mechanics that force you out of range without misaligning it or losing uses
If none of that matters for you because you don't do content that would benefit from this change, good on you.
Doesn't mean everyone else asking for it doesn't have a good reason to do so.
On a side note, blowing Lilies to get a Blood Lily is a dps loss unless you're able to dump at least one during downtime.
Dumping them between pulls in Expert is great but not every boss has enough, if any, transitions to do that nor is it always possible in terms of healing because dumping a Lily during transition only for you having to Medica II is an even bigger dps loss and makes no sense.