Jal - you grow your tomatoes 3' apart in dry UTah. I grow 5 tomato plants, with other plants, in a 4x8' bed in humid OHio. I pinch suckers out of my tomato plants so that they don't get too crowded, still have air circulation, and hopefully don't spread diseases and infections so much.
Some people also say that pinching the suckers out makes the plant grower fewer but larger tomatoes. I'm not sure about that and don't have any data for it.
There is NOT one right way to do anything in the garden. ALL GARDENING IS LOCAL and everyone has to figure out what works for them.