Navigation is the hardest piece of sharing code across platforms. Web has plain URLs for navigation state, whereas apps have complex sets of nested navigation patterns (stacks, tabs, modals, drawers). By combining the approaches into a single mental model and API, devs can build for Web and Mobile with ease. This is touched on at length in the "Methodology" and "Gradual Adoption" sections of the Solito docs.
The gap between web devs and native devs is shrinking. This stack enables you to ship native apps and websites with a single codebase. I'm the only frontend engineer at our startup, and I was able to do just that as we scaled to thousands of users (see https://beatgig.com). My goal with Solito is to 1) provide the code to let others do it, and 2) perhaps more importantly, document clear patterns to deal with platform differences.