The unfortunate and perhaps unavoidable issue with abilities that mitigate damage like Expanded Bole is that they are actually useless in the wrong context, and some players don't understand this.

It's kind of like the SCHs who run around dumping Sacred Soil because the buff looks good on paper; they don't imagine how a 10% damage mitigation can be a waste of a stack unless they stop to ask themselves if it actually helped them use fewer healing actions and realize that the answer is usually no.