Building your own is educational and maybe even fun (to a point), but it's not going to magically fix these kinds of issues. Most if not all frameworks support

Building your own is educational and maybe even fun (to a point), but it's not going to magically fix these kinds of issues. Most if not all frameworks support navigation and custom framework XYZ probably isn't going to do a better job. The fact that some sites do a bad job at navigation, performance, or whatever really seems orthogonal to me. We can also come up with numerous examples of "classic" sites that are slow, bloated, and have a bad UX.