To be fair for the Ra-Den example: You probably don't touch the orbs. If you had to dps Ra-Den/cracklings/orbs your dps would drop.
And the Lei Shen example: we should be better than rogues. They don't do well for AoE on targets that die quickly and we also should have trinkets+pot+TF for our MEGA BitW rip because of the long period of time before our execute range without dpsing.
I'm not saying we're in a bad place because we're fine. I also often top dps and we have a rogue/warlock/hunter in our raid. I'm just saying that those fights kind of highlight our strengths (high single target dps, good AoE (still not great, but good), powerful rip extensions for execute, and decent cleave damage - cracklings - and only decent cleave damage if you have a warlock . . . maybe a rogue, but redirect sucks compared to soul swap).