The specc still feels too clunky in aoe and st:
-You want aoe agony, but the only way to do that (Vile Taint) has a longer cd then agony's duration. Tab targetting amongst 10 mobs isn't really anyone's idea of fun, and spriests, assassination rogues and feral druids, other dot classes, rightly don't need to. It's long past time Affliction joins this modern crowd.
-The same is true for single target. Removing siphon is a good idea, but needing 3 dots before you even start doing damage is just weird in 2024. Give Soulburn an effect that applies all the 3 major dots (agony, corruption, UA), either with a 2-3 shard cost and no cd, or a 1-2 shard cost and a short cd. This will also make outdoor play infinitely funner without impacting dmg tuning whatsoever, and at the end of the day speccs are meant to be fun.
Pvp dmg will be tuned by how well the lock can fake cast and get off Malefics and soul rots and Unstables that they're not spending shards on. But actually applying your dots manually will be something you choose in order to maximize damage, in middle of fights, not forced into on every new mob.