- Application support for graphics editors that people need in 2019... you can either run macOS or Windows for this
- Built-in cross-device syncing like iCloud/CloudKit
- Smooth integration with peripheral devices (e.g, HandOff)
This list could be extended for quite a ways, as people seemingly want to ignore part of what still makes macOS great - you have very well done product integration across the entire stack. I want it to "just work" in 2019 so I can live my life instead of tinkering with an OS/hardware combo.
The analogy I like to give people is that buying a Macbook is kind of like buying a BMW after years building your own tuner car. I'll always enjoy building my own, but man... if my daily driver breaks, I just wanna pay someone to fix it. Gimme the luxury feel already.