So instead of BLU offering what damage it can put out, it should stand there and leech until a BLU proc comes up? I'm sorry, but you are narrow minded, naive, and to be quite frank: stupid.

If your tanks are getting one shotted, they need to suck less. Nothing short of a doom/death move should be capable of one shotting anyone that would be in melee range. Your healers are lazy and horrible if they don't heal everyone that they're accountable for, that includes Blue Mages. From the sounds of it, your linkshell is just bad, and your ideals are either shaped by your experience with them or you're bad as well. I truly hope no one takes your advice and stands on the sidelines leeching instead of being productive.