I think Moniq is making the important point that using invul comes with a cost/benefit and thus you have to decide whether the benefit of using is outweigh by the cost (cool down time and not being able to perform other actions. That is what she means by strategy. Situationally invul has a HUGE benefit, therefore, the cost MUST be great. I can see why you may argue that the skill should be rebalanced, but since there can be no split between PvE and PvP skills in Ryzom the propasal is wholly unbalanced, it removes most of the cost from using the skill and thus in PvE would be complete overkill.
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