I do that all the time, but I choose my targets among future objectives for ground offensive to smooth them out a bit, not because they are more vulnerable, and if they happen to be both, well, all the better. I also do that with pocketed units to make them burn supplies faster. Finally, when I wish to have a little more info on enemy units than what normal recon can give, a good old bombing run sometimes does the trick.
The fact that the Soviets can bomb a lot is indeed a good balancing tool for their lack of recon.
You can hit fort levels with some effect too. I use big bombs for that, like the 1000 kg Ju-88As, which are not as efficient as dive, tacs and H111 on unfortified targets to begin with
"So much trouble in the world!" -Bob