Necessary or nice to have?

https://www.youtube.com/watch?v=XbTG0AqJDqs&list=PL443E7C38A9934280

Brad Bird is known for his work on Ratatouille (2007), The Simpsons (1989) and The Incredibles (2004). He talks about the importance of time and focus being spent on subjects that matter versus the ones that don't matter.