WiFi.
If Apple *still* can't fix it. After months of being broken. On premium hardware and software.
Then they are either incredibly incompetent or arrogant.
Incompetent because with all that huge cash pile that can't get this right when others with me control like Linux and even Windows can.
Arrogant because they'd rather invest in emojis. While people who paid over the odds for computers that need for work and daily life end up with a shiny brick.
Even my cheap netbook WiFi works.
Your cheap netbook doesn't do Continuity or Handoff. I'm pretty sure that's the main problem (I guess discoveryd related). What mac model is yours?