1. What works for one company won’t necessarily work for other companies. A so-called best practice is dependent on a firm’s strategy, organization structure, quality of their technology apps and infrastructure, composition of its client base, the quality and composition of its product line, and a gazillion other factors. For another company to simply say “oh, we’ll do what they do because it works for them” is short-sighted.
What most people think of as "best practice" is actually better known as "common practice." That is, common practice is what people actually do.
I often hear colleagues ask, "What is the best practice in this area?" and they get responses like "this is what did at my last company." But that's not "best", it's just what one company does.
"Best practices" are research-driven. Companies that do 'x' get result 'y'.