I'm have no insight into why. But it is what's listed on the specs: https://www.apple.com/ca/macbook-pro-13/specs/ https://www.apple.com/ca/macbook-pro-13/spec

I'm have no insight into why. But it is what's listed on the specs: https://www.apple.com/ca/macbook-pro-13/specs/ https://www.apple.com/ca/macbook-pro-13/specs/ > Simultaneously supports full native resolution on the built-in display at millions of colours and: >One external display with up to 6K resolution at 60Hz