is there a way to set a default route with React-Router v6

I just can't find a way to set a default route with react-router v6

Is it because it's not a recommended programming approach anymore?

If I understand your question about a "default" route correctly then I am interpreting this as one of the following:

1. Use an index route:

   You can wrap a set of routes in a layout route and specify an index route:

   <Routes>
     <Route path="/">
       <Route index element={<ComponentA />} />
       <Route path="pathA" element={<ComponentA />} />
       <Route path="pathB" element={<ComponentB />} />
       <Route path="pathC" element={<ComponentC />} />
     </Route>
   </Routes>
   

   or

   <Routes>
     <Route path="/">
       <Route index element={<Navigate to="pathA" replace />} />
       <Route path="pathA" element={<ComponentA />} />
       <Route path="pathB" element={<ComponentB />} />
       <Route path="pathC" element={<ComponentC />} />
     </Route>
   </Routes>
   

   The index route is the route that will be matched and rendered when the path exactly matches the root parent route's path.

2. Redirect to a "default" route if no other routes match:

   You can also render a redirect to the route you consider to be the "default" route.

   <Routes>
     <Route path="/pathA" element={<ComponentA />} />
     <Route path="/pathB" element={<ComponentB />} />
     <Route path="/pathC" element={<ComponentC />} />
     <Route path="*" element={<Navigate to="pathA" replace />} />
   </Routes>