Bigger fruits can be a notable benefit of pruning, as the plant is able to focus much of its energy on existing fruits instead of new growth.
Well pruned plants will provide you with more opportunity to see issues as they arise, especially as you will be working on the plants more often.
If your tomatoes become a tangled mess, it is very unlikely you will be able to see the underside of a leaf where eggs are being laid, or the early signs of a fungal infection before it’s too late.
More space between leaves also allows you to spot and treat pest or disease presence more quickly.
This is especially beneficial if you live in an area with lots of rain because the leaves will dry more quickly, and wet tomato leaves are very prone to fungal infections!
As a result this reduces the likelihood of many disease pathogens breeding and spreading amongst your tomato plants.
Pruning can improve airflow by thinning out the foliage between and within plants.