Because I live in the west San Fernando Valley I let the tomato plants grow as much as they want. That way, the branches and leaves provide a canopy over some of the fruit. There's plently of sun to provide energy to the plant. I don't need to prune branches or suckers to provide more energy to the rest of the plant.
But I do make one exception. Scott Daigre said during a tomato 101 classes at CSUN struck home. He stated "Tomato plant diseases tend to come from the soil. So trim the low branches that are in the dirt." That made sense to me.
Yesterday I trimmed (most) all the lower branches from the all the tomato plants. That took a while but I'm glad it got done. Not only are there no dragging branches but the plants themselves look better without all the low growth. Well, today I noticed a few more I could have cut but they look a lot better.
During yesterday's cutting I noticed that Jaune Flamme has growing tomatoes.
Today I noticed that Sugar Snack and Green Grape have growing tomatoes.
I should mention that there was a pretty heavy heat wave last week. It got into the mid 90's for several days. Also, several days were quite windy. Paradoxically, non-damaging wind storms tend to make tomato plant trunks more sturdy in the future.