I've never had a problem with the Cowboys not tackling in training camps or practice. While I find the tackling is usually a little sloppy early in the season, the September/October records that Wade Philips has coached are fine enough for me to not care about it.
Now, however, I'm wondering if the Cowboys should tackle in practice until the offense gets better. Romo recently spoke about how sharp and crisp the Cowboys have been in practice, which is odd considering how awful the offense has been in preseason.
My thought? Football is a different game without tackling. I've never seen them practice, nor have I ever visited one of their training camps, so I don't know how they do it without tackling, but that's just my thought. Maybe the Cowboys are looking crisp in practice because they don't hit each other, and maybe the offense can get more done if the defense really gets after them.