I've currently geared my warrior tank with avoidance and am sitting at around 30% Mastery. With that amount of Mastery, is it worth it to use Shield Block at all? I still use it since I use the Heavy Repurcussions glyph and use Barrier in order to fill in the gaps when Block is on cooldown or if there's an unblockable attack incoming. I was wondering if it was worth it to completely forgo Shield Block and instead rely purely on Barrier? Or is it still worth it to use Shield Block even though I have low mastery?
I do prioritize Block when tanking multiple mobs, so this is more of a single-target question.