Will WHM be getting a new trait to replace ProShell?

[Cynfael]

None of those things are really a class issue, more of a mechanic thing.
"poor raid DPS" - While not exactly the high, it's not poor either.
"accuracy" - This is more on Square-Enix's mechanic design:
1) For some reason Bio, Bio II and Shadowflare requires no accuracy, but a giant explosion of light can actually miss while you're right on top
2) Accuracy isn't readily available bar some very minor numbers on every piece. Unless resorting to crafted gear, neither healer can reach the accuracy cap for the harder content. But this applies to both healers. Scholars simply don't need accuracy to deal decent damage - They'll want it to deal good damage, though.
"overhealing" - And this is more of a player's fault, rather than the class fault. Overhealing will always be there. Be it on Scholar or on White Mage. It's higher on Scholar in some cases, where the scholar's the type that shields everything before impact.

Agreed on all points.

Lack of native ACC really hinders WHM more than it does SCH for no obviously good reason. I'm curious to see what happens with this heal-while-DPS skill. My hope would be that they overhaul healer gear to provide options for more native ACC, but I'm thinking it's more likely that A) this ability won't require a hit check or B) it will require a hit check and thus be marginalized for raid use by any WHM not stacking ACC with crafted/relic.

[Lyrica_Ashtine]

Not in the sense you're trying to make, no. The real problem lies here:

Lack of native ACC really hinders WHM more than it does SCH for no obviously good reason. I'm curious to see what happens with this heal-while-DPS skill. My hope would be that they overhaul healer gear to provide options for more native ACC, but I'm thinking it's more likely that A) this ability won't require a hit check or B) it will require a hit check and thus be marginalized for raid use by any WHM not stacking ACC with crafted/relic.

[Yhximott]

That's exactly some of the sense I'm trying to make, but whatever. Take the last word if you want, I'm done with you.