My team is in the process of building a design system, and you're absolutely right that it doesn't happen overnight. We're several months into the process and haven't even begun writing code yet (small team + other projects to balance). We're hopeful though that it's going to be worth all of the upfront effort & maintenance effort to keep our branding more consistent and to improve developer experience on future projects.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.