Blessed Earth (as opposed to Bless) is indeed very good. You only need 5 Precisions *as a group* to break even, and as you pointed out, summons can't get Precision Stance, so it's much more useful for them (without the usual "I used a buff on a summon, feels suboptimal" syndrome).
But that requires several points in Geomancer; you can't just splash it.
