As of 3.4 Hotfix #3
Granite Salvo is still overwriting and preventing Motif of Bravery.
Inspiration is overwriting and preventing both.
Ashen Defense is still overwriting and preventing both Coda of Cowardice and Curse of Frailty on the target. They're still spreading aoe normally. Crumbling Resistance isn't having this interation. It's not an issue per se. Just odd interaction that would probably be beneficial if CR was interacting the same.