It's a talent that you will pretty much always take. If you think it's important to your survivability then argue for it to be baseline in your post. And yes, it's 4 to 1 since that's affliction's toolkit compared to destruction's, add on 3% damage reduction average to destruction if you want.
Yes of course everyone knows they are different, but in this case they are the things to compare. Destruction is a bit better at mitigating damage by design, and affliction is far better at healing through damage already taken. If you think this is worse by design then say it is and why. It's not a lot of explaining at all, get the destruction lock scared so he pops unending resolve, switch for 8 seconds then come back for the next 52 seconds when they have nothing compared to the affliction warlock.
8k per second, per target. In a 3s which you are talking about you'd have 3 up. And by itself it's not loads, no, but it's passive and is on top of the other things.
I'm just trying to be constructive, there's no need for your tone. You could actually make some good points in the original post from what I'm saying. Affliction puts out a good chunk of healing when siphon life is up on multiple targets, corruption is up on multiple targets and you are draining life as a filler. You could have argued that this is great in theory, however since UA doesn't give much dispel protection a lot of your healing is simply dispelled away.