- Out-of-combat resource regen
- Damage output potential
ToT encounters weren't as crippling regarding movement as 5.0 raids. We could manage by using glyphed mind flay, FDCL and even glyphed SWD in fights like tortos. But if movement intensive fights return (which wouldn't be bad, movement is a good thing) we will be in a bad spot again.
Shadow orb out-of-combat regen just makes sense, let's hope they listen to us as they did with the most recent change to SA (which we asked for repeatedly since 5.2 ptr):
That being said, the real problem with shadow is the same we have since 4.0. It's a nice, fun spec to play but there's no justification to bring us to 10-man raids. When ToT started I was happy because the first fights benefited multidotting. Then came mages with a 40% buff to nether tempest along with our -25% SWP nerf, and there went the fun.
We currently have no niche, no special ability justifying bringing us to progression raiding in 10-man, and most of all, no way to contend on fair grounds with other dps specs. We depend on unreasonably lucky proc streaks to barely hit average on any fight but Council of Elders (or primordius if you decide to pad the meters...). Honestly, a lucky streak of UVLS - Legendary Meta (~30s of haste-buffed crits!) should allow us to at least make it above average. I also play a lvl 90 frost mage alt and I have no trouble being on top of meters on ANY fight, single target or multidotting, without actually doing anything special.
Our severely nerfed off-healing and mass dispel remain as the vestigial excuses for not aligning our damage with other classes. Other hybrid class specs such as enhancement and balance are able to perform more than well within their dps role, while also bringing powerful off-healing tools as tranquility and AG/HTT. Mass dispel is useful in 2/28 MoP encounters, and even then it is brought by holy / disc priests which are by far more justifiable for 10-man.
There's still time before 5.4 launch. PLEASE take a look at these issues (not as in 5.2 when you acknowledged we were gimped one week before launch and then nerfed us again one week after).