How should a large Flutter app properly structure its own overall routing architecture to genuinely scale well as the total number of individual screens grows into the dozens or even hundreds?

A large app with genuinely dozens or even hundreds of separate individual screens typically benefits from organizing its own routing definitions by individual feature, with each individual feature module properly defining and exposing just its own genuinely relevant specific routes, which are then properly combined together into one single unified overall router configuration, and adopting a considerably higher level routing package like go_router, combined with a genuinely clear, consistent team wide naming convention for route paths, helps meaningfully keep this particular overall routing structure genuinely organized and considerably easier to navigate and maintain even as the app itself continues growing steadily larger over time.

// Each feature module properly exposes its own routes
final checkoutRoutes = [GoRoute(path: '/checkout', builder: ...)];
final profileRoutes = [GoRoute(path: '/profile', builder: ...)];

final router = GoRouter(routes: [...checkoutRoutes, ...profileRoutes]);