We've been building websites since 1996, long before responsive web design and today's array of mobile devices were concepts brought from science fiction into everyday life. Keeping up to date with current standards is an ongoing process, always watching new technologies as they are introduced and adopted.
It's important to be aware of new frontiers in technology while also being mindful of each client's target audience. The newest, biggest, and brightest innovations may work reliably on only a handful of devices. In web development, the term "graceful degradation" means that cutting-edge devices can use cutting-edge tricks while the website degrades gracefully, still displaying a coherent and professional website to every level of older device or web browser that the audience might use.