Show HN: Built a browser-only quiz platform with no accounts or back end (superquiz.online)

I built a quiz platform that runs entirely in the browser: no user accounts, no backend, no database. All progress and results are stored locally (LocalStorage). The goal was to see how far you can go with a “dumb but fast” architecture while keeping the UX clean and frictionless. I’m interested in feedback on: - trade-offs of browser-only persistence - scalability limits of this approach - obvious things I may be overengineering - or underengineering