Even when embolden is factured RDM is not close to BLM in dps, while SMN is above BLM before rdps is factured (175 rdps and the gap is about 200-400)
SMN devotion might not be on par with embolden in raw power ye, but it also offer some mitigation components that really should not be dissed when you have mechanics like say morn afah or gigflare where everything counts (not to mention the 5% extra healing potency means a slighly larger shield mitigation)
And that's before considering the 1 min /24 secs radiant shield and if we really want to maximise dmg SMN also can use contagion to offer some extra magical dmg if you really want it.
As for movement, as said if you need to move for more than 2 GCD SMN loses about 30 potency/gcd UNLESS they had a R4 in store in which case they gain about 70
Also can't really consider the planning department a problem for SMN since everyone's rotation is affected by mechanics to an extent even RDM
RDM after dualcast has not much else since everything else Besides OGCD is casted,
The only really thing that RDM has over SMN is beign able to quick raise more often which sadly is good only if the content allows to
oh and maybe helping healing shinryu's dragons head if you really want to count that
