Hmm isn't frozen food - even veggies - very close in content to fresh food? The real problem being not how the veggies are stored on their way to us, but how they're grown industrially?
Ripe tomatoes are more delicate than underdeveloped, still green tomatoes. So pick them before done developing, ship them, and they'll turn red in the weeks it takes to get to the store.
And if they are picked ripe, they'll also go bad before they even get to shelf via their weeks long boat journey.
That's why local is better, and your own garden better still.