User experience... or UX as all the cool kids call it... is an important slice of the pie. It's the place where the thing you've been pouring your energy into intersects with the humans for whom it was made. And this angle of industry is ubiquitous because essentially it's function is to make sure that when that happens -- when people touch / feel / experience what you've worked so hard on... it's a genuinely positive situation. UX is not limited to a department. Proper UX should be woven through the fabric of your brand/organization/product from start to finish. Here's why:
UX = EMPATHY
To effectively filter your ____ through UX, you simply must approach it with empathy at every step of the journey. From "What question does this answer or problem does it solve?" to "Does this aspect of the design create a seamless engagement for the human interacting with it?" ... To literally every other question you should be asking -- the common thread -- the golden nugget -- the question behind the question -- is always centered around placing oneself in the heart/mind/soul/shoes of that person you intend to engage. It's not just about your product. It's not just about your brand. It's ALWAYS about how those things come in contact with that end user -- and ultimately how it makes them feel.
Here's a quick litmus's test: If you've compromised significant quality or design that you know is better/important to the people you touch -- you aren't being empathetic. Try again. Be human.