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I'd read up quite a bit about tomato plant growing and how a bushy plant is supposed to be a recipe for disaster, as the canopy provides an opportunity for disease to flourish.
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If you grow in containers soil borne disease is a lot less likely than growing plants in the dirt. If it's airborne disease then it does not matter how much foliage you have or whether it is growing in the ground or a container. This is why we stress preventative applications of fungicides rather than wait till your plant gets infected then it is too late.
I grow my plants in containers, raised beds and open ground and have never pruned my plants. I do spray my plants periodically with bio/bio friendly fungicides and do not have a problem with disease. Check out our "Common Garden Diseases and Pests" Forum as there is a lot of good info in there.
Ami