Remix treats nested routes files differently. Its not simply a flat list of routes. Take this example-

routes
  team
    index.js
    $username.js
  team.js

• The outer team.js acts as a layout component and it will render for any /team/* routes. It has the option to render an Outlet component to decide where to render child route content.
• The inner team/index.js only renders at /team.
• The inner team/$username.js renders for /team/adi-1, /team/adi-2 etc.