When my son learned of Boseman's death while he understood why T'Challa wouldn't be in the new movie it still broke his heart that he wouldn't see his favorite superhero in movies any more. It's not just like insert other black superhero and all is well because they aren't his favorite hero. That honor goes to T'Challa so no matter how amazing we know Sam & Blade are it doesn't mean they automatically will fill that void for kids who look up to T'Challa.