Because SketchUp only supports one character shortcuts, assigning 4 of them costs to much keyboard realestate when modeling.
If your model is ready (end edit mode?) it could be a user’s preference to automatically switch to ‘navigation mode’
Enscape has wasd control, I am sure there are other renders that support it, to.
As @gsharp noted, this could be a gen thing.
Anyway, you can still sign up here: