You forgot shield slam. Shield block is more dmg mitigation than threat gen, similar to Disarm, but on a much shorter cooldown. Shield slam on the other hand is a very good skill to use to have snap aggro on a mob that suddenly changes it’s target due to RNG moments like a series of crit hits on spells from a dps or the healer. When used effectively, you can prevent those “oh crap” moments from happening and thus save Taunt for when it is truly needed