Now that we have a porch, starting fall seedlings "inside" is much less fiddly than previously. I set the flats of broccoli, cabbage, and Brussels sprouts on the edge of the porch where they'd get plenty of light, so I didn't have to worry about legginess and hardening off to the scorching summer sun. And since the flats were right next door to the hose and the floor is water resistant, I could just sprinkle them lightly whenever I thought about it.
Having transplants makes it even easier to fill gaps in the summer garden with fall crops. After using up the spots that had been home to problematic tomatoes with broccoli and cabbage, I had enough seedlings leftover to devote half a dozen more beds to fall crucifers. I'm hoping for bountiful late fall harvests to tide us over on fresh produce further into the cold season.