"I think you'd get a similar result, but added benefits, to instead doing some extensive mobility work, i.e. dynamic warm-up type exercises."
This is what I would do (and it's what I do myself, actually). And if it matters, I only train twice a week now. Those two workouts are pretty long and tough, but it's all I can do with my schedule. I feel great and the lifts go really well. Don't be afraid to listen to your body.