Cooking vegetable and fruits sous vide is a great way to tenderize them without losing as much of the vitamins and minerals that are normally lost through blanching or steaming. Fruits can also be infused with liquid when cooked at lower temperatures when liquid is added to the bag.
Sous vide helps preserve the nutrients present in fruits and vegetables by not cooking them above the temperature that cause the cell walls to fully break down. This allows them to tenderize without losing all their structure. The bag also helps to catch any nutrients that do come out of the vegetable.
While time and temperature do not factor into safety for fruits and vegetables they do have a unique effect on their structure. There are two components to vegetables that make them crisp, pectin and starch. Pectin, which is basically a type of glue and is also used in jams and jellies for structure, breaks down at 183ºF / 83ºC at a slower rate than the starch cells do. In many cases this allows for more tender vegetables that have a unique texture to them.
The time component just governs how long the starches and pectin are breaking down for and how tender the vegetable will become.
Pears are one of my least loved fruits when eaten out of hand, but when they're poached in butter, sugar, vanilla, and spice, well, that's another story. Normally, you immerse the pears in a flavorful liquid, such as wine or sugar syrup, and cook them on the stove top. Then, after they're poached, the cooking liquid needs to be reduced to concentrate its flavors.
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