Why is using prepared fruit any different, essentially, from using prepared wool, say, or cotton or leather, or using tools someone else has made instead of making the tools oneself?
We are all people of our time. A hundred years ago we would have had to boil up bones to make stock; now we can buy stock cubes. A hundred years ago we would have had to make all our own clothes; now we can buy everything ready made. Further back in time we would have had to grind wheat to make flour, make candles and soap, spin wool and linen.
Are we all 'bone idle wastrels' for not doing these things now? Yes, some people still make their own patchwork quilts, candles, spin and dye their own wool and so on, but they don't have to. It's a choice, they enjoy making things. 17th century housewives had no option.
So today we can buy ready prepared fruit and veg. As bags says, why is this any different?