Posted: 29/07/2013 at 11:59
bigolob, there is always new research popping up on these sorts of things.
The science is that the plant needs foliage for photosynthesis in order to develop, but the foliage also serves another purpose, particularly in hot, sunny climates. It protects the fruit from exposure to hot, direct sun that can result in sunburn (sun scald), nasty leathery patches on the fruit.
If your climate isn't likely to bring about sunburn, trim away. Here, where the plants are currently baking in close to 40C all day, I actually tuck exposed fruit behind foliage.
What's more, as I posted somewhere here t'other day, the closer the fruit gets to maturity, the less it draws from the plant. By the time it's changing colour, the fruit is drawing next to nothing from the plant.