Yeah, but a lot of that energy that is released isn't in happy forms. D-T releases not just high energy photons but also neutrons which are carrying away a lot of the energy. So what you actually need is something that can absorb the neutrons in a safe fashion and convert that to heat. Lithium blankets are a commonly suggested solution since a lot of the time lithium will form tritium after you bombard it with neutrons (so you get more tritium as a result). There's also the technically simpler solution of just using paraffin. But the conversion of the resulting energy into heat for steam is decidedly non-trivial.