I think the article does a pretty good job of explaining the gap between what can happen easily, and what a 110% over engineered "perfect" solution is to a UX problem.

Building excellent user interfaces is hard, regardless of the technical stack. You have to sweat a lot of the finer details, break out of any platform default behaviour where appropriate, and over engineer something in service of building a 'delightful' user experience.

Or, you can do as most do, and just not do this. #anchor-links with `scroll-behavior: smooth;` CSS will get you the basic smooth scrolling.