There are so many experts on how to grow great tomatoes almost anything you do will either match an expert or two or be diametrically opposed to another group of experts.
My experts do not advocate removing any parts of a plant except those in contact with the soil to help prevent soil borne disease problems. And with a good mulching program that keeps soil contact away from leaves little pinching is required. A tomato plant is very efficient in its uses of resources so that during green plant growth it uses resources to grow stems and leaves. The experts also say during fruiting resources go to the tomatoes. A tomato will be either good or not more because of the variety, weather conditions and disease complications (or lack of through good gardening practices) than whether parts are trimmed off the plant. So says my experts.
Me, I let the tomato plants do their thing and help as much as I can as long and do so as long as they are growing without any end date in mind. Those greenies sometimes turn color late in the year and are very welcome.
After a year or so of growing tomatoes everyone is an expert in their own garden.
