Grav Pistols against MEQ are decent, but Plasma is cheaper and wounds more targets on 3+. So I guess if you only fight 3+ armor save guys it could be worth the extra point.
There usually isn't enough left of the psyker once my Templars are done with them to decorate the base.
Hence the chunks of glass from the finely ground Witch sand being flamered.
I mean its 40 dudes charging supported by Dorn-style Heavy Bolters while a Castellan guides his brothers on where to direct their fury at not being stuck in. Really it doesn't feel very Templar because no tanks.