Between Farsight and Supremacy you likely sign need Tactics for everyday teaming. But with the purple patch (fighting purple mobs), debuffs from certain groups (Thorns, Arachnos, etc) and your T1 and T2 pets being lower level, I like to have it for those outlier moments.
You are correct, set bonuses do not transfer to pets. They only inherit unique IO abilities that specify they affect pets.
I always have Maneuvers and Tactics on every MM.