My store is by no means shady about any of the break guidelines - everyone gets their breaks, everyone including backroom gets a complete daily schedule with set breaks and meals. We usually do wait until Autos are complete before the backroom takes their first break, though, and I believe it is a motivational thing coming down from the leaders. If we just have a few more pulls to go, the team lead can say, "Let's hustle and get done so we can go to break!" as well as the fact that a lot of the team members grab a bunch of food, cram themselves full, and come back all slow and sluggish after break (actually pretty funny to watch now that I'm now longer part of that team.)
As far as I know it's not breaking any Target policy as long as you get your breaks in reasonable time and don't break any compliance regulations; the posted sheet with meal and break guidelines is just a strong recommendation as far as I know, not compliance guidelines.
Out of curiosity while we're on a break-related thread, has anyone ever gotten in trouble for skipping a break? I know it usually goes the other way - I've seen people coached for taking a long break or extra break, and I know you're supposedly required to take your breaks as mandated by your leadership and the length of your shift, just curious if missing or intentionally skipping a break gets enforced at all.