who? The p10s Spooder? Probably still stuck doing Bonds 3, because PF could never..LOL.
I never said you need Bell for HH (savage), but you do need your level 90 Kit to survive it. In the same way, you don't need Tank LB + Bell to help with the Phase 2 Multi-hit of M4s, but I doubt you can do it with a level 50 kit (for example).
Why specifically 10, because it's a challenge and because I wanted to see how you resolve a constraint and how outside of the box you can go.
As for being better than what SE already has in place, no, your build has no innovation and I doubt has any viability in the current content as well. You just moved a couple of things around and called it better while bringing essentially nothing new.
If you were to include let's say.. several modifiers then perhaps.
Let me give you an example of how I would solve the restrain while also tying it a little to a familiar system but giving it a little more purpose
Glare-> Cycles between 3 Colors -> white/Blue- Green- Red. Each color will interact with the other spells and transform their effects.
White/Light blue: heal, regens HOT - Revive
Green: shield, mits ->aoe/single target, some debuffs for the boss, small buffs for the party and yourself
Red: DPS - AOE, single target, DOT/s
In addition, there is a "talent" tree that can further change how spells function and control the stuff they provide allowing you to coordinate with your co-healer if you want or simply enjoy a certain play style.
PS: I don't give a F about how Lucretia cleared the fight because there was also some random party that cleared Golden Bahamut with full tanks too. Those are already outliers and I doubt 99.99% of the player base can achieve that, but kudos to them I guess..
@Tigore
Essentially all healers in every single game are filling the same role. That is to heal and protect their allies, enabling them to continue the fight and mend/mitigate/prevent when mistakes happen.
Also, I have explained already why the number 10 was picked.
It's easy to say you would do a better job until the jig is up and you actually have to come up with something that is at the intersection of fun, rewarding, unique/innovative, it can function at low but also end game that is easy to pick up but also hard to master.