I’ve never been much of a pruner with tomatoes; I cage my tomatoes and play the “hunt for fruit” game, heh. I prune to keep the plant in bounds, to thin it enough for air circulation, and I remove diseased leaves and stems as soon as I see them.
But this year I am trying an experiment with two tomato plants - same variety, same bed, planted same day. One I am pruning in the usual manner and the other I am pruning most of the suckers. I know that anything I do with just two plants will be anecdote, not science...but it should still be interesting. I’ll be recording yield, quality, and pest/disease problems in my garden journal.
Harsh. And big fruits with thick flesh. Not a bunch of paper-thin tomatoes or peppers.
But it's good to question and to see for yourself.
/johnny