I agree, tactician is way too easy. Most fights are first try wins, even boss battles. I don't feel any need to use oils or elixirs. And I purely level and skill my characters for flavor instead of effectiveness, and still it is trivial. Not once I felt the need to use a defensive spell. And I even restrict and handicap myself. I am intentionally not summoning the 4-5 summons I could have every fight.
