Byrth pretty much covered it all in his post.
The fact that you wrote 'Enjoy" at the beginning of the post just makes me think you have no clue how frustrating this update is...
By not considering any waltz timer split I feel like you forget that our TP caps at 300, while in abyssea WHM have a practically endless MP pool and can spam between Cure V and VI with added stoneskin effects. I appreciate DNC's cures are not intended to be the powerful but try healing something like Apademak on DNC, it's just not gonna happen due to having to already contend with front line debuffs. Even as duo and DNC main healing, if DNC got paralyzed and healing waltz doesn't go off you're now stuck with a huge recast for it to potentially be para'ed again. Something like waltz splits would mean if Healing waltz got para you could try curing waltz to try and see your HP through.
Has the dev team actually tested split timers in a fight to see how it does compared to other healing classes or do you just assume it will be more over powered?
In regards to 1 finishing move once steps are at Lvl 5 I don't see much reasoning behind this at all. You say we should alternate steps but surely that's down to each players own discression what steps they want to use. I don't want to alternate for the sake of keeping my finishing moves effective. Do other jobs have penalties for favouring a particular enfeeble...