Platform Standards
WordPress is an Open Source project built with technologies that are also used on many other platforms and projects. Each of these (HTML and CSS, Javascript, PHP, MySQL, etc) can be used to great effect in many different ways and with many different implementation schemes. Like any other platform built on these technologies, WordPress "prefers" to do certain things in certain ways, even though, strictly speaking, we can ignore "The WordPress Way" and build as we wish. Possible, but rarely advisable.
Your project will be easier to implement and maintain (and therefore more affordable to use) if everyone you hire to build for you, respects the platform's standards. We are devoted to using the standards established by WordPress when working on a WordPress project. And when we build on other platforms, we shift to the appropriate standard there as well.