Funny thing is that not only we collected multiple sources out there but we also went in-game to test it on his priest. We only did the work of duplicating results that already exist out there. Like I've mentioned: Static values are static values and those will never change.
You should ALWAYS test stuff without "crutches". If we're talking about a BiS perspective, "crutches" are a myth. In case of new players playing this class, I believe that they should start by trying to master their capabilities without "crutches". That's what makes exceptional players and not just another one. However, that's a learning curve that people should decide by themselves; If they want to be really good at what they do, they do it as they should without "crutches" involved. That not only lands more experience and more information about your class but it also makes you develop in a really steady pace.
Also, in the situation that you're refering, either you trust your raid comp or you don't. Either you have competent raiders or you don't. If that raid team isn't able to support you as they should, it's not your fault. Sinergy is the thing that makes the world go around and a raid is a team effort no matter what people try to do or point out.