Lastly, both Contagion and Radiant will time up with TA and other 60 sec cd's. Tri-D, Aetherflow, one Akh Morn and Shadow Flare will too. So, points about RDM's increased utility are valid, but I'd it's at least even for both classes as far as synergy goes.
I do agree with you 100% that HW abilities were amazing additions to the class and SB abilities are lackluster in comparison, especially Devotion, which is utterly useless.
The only thing you've thrown out as far as RDM being complex and rewarding is using the melee combo. I know people who find using it safely and efficiently in Savage annoying, but not "complex". It just sounds like an inherent part of the class that will be annoying and difficult on certain fights, like BLM's inability to move a lot.