So, why do we need to prune our green beans in the first place? Well, when you don't prune, your plant can start to get a bit leggy - it grows all long and gangly, with fewer beans to show for it. By pruning, you're helping your plant focus its energy on producing more beans, rather than just growing taller and taller.
It's kind of like when you're trying to multitask - you're spreading yourself too thin, and not really excelling at anything. But, when you focus on one thing, like your plant focusing on producing beans, you get a much better outcome. And, who doesn't want a better outcome, right?