A good user experience (UX) is essential for customer loyalty. It doesn't matter what you sell online; paperclips, consultancy or vintage pottery - customers will desert you if you offer poor customer experience.
Back in the day, it was OK for you only to have a ‘web presence'. Many corporate websites were often like an online business card. They only contained bland corporate information and contact details. Today, though, your website must have a purpose and be functionally organised to meet your goals.
But web users can be fickle. And with so much competition for digital eyeballs, your website needs to be quick to load and easy to navigate. Today, there is plenty of UX data for how users surf the web - what keeps them on the page and what causes them to reach for the back button.

https://www.hitechies.com/user-experience-best-practice-core-web-vitals/