The low down for the resurgence of UX Testing, is simply based on making your site work effectively for real people.
Test early and be willing to change the design
Stoke empathy for your customers Because being empathic for your prime demographic will help you create more effective experiences for them.
Get feedback and be open to change
Making a bold and simple design is half the battle, bringing sites in to the home plate requires at least some testing, and changing based on those tests, to make your site the most usable it can be.
Thanks for reading!