I don't want to carry two phones. I'm part of a team that owns some responsibility for fixing things that break in the night. I find it freeing to be able to reply to a Slack or Outlook email while I'm with my kids at the playground.
I see the above advice all the time, but I can't help but think it only relates to an IC with no career ambition, no outside responsibility distractions (kids schedules), that's 100% committed to 9-5 life and has little opportunity for big promotion based on being part of a chain of ownership for things that are customer facing.
Personally, I've mostly worked at small companies (my preference), and have ambitions. I have a healthy work/life balance, but also don't want my products to fail and occasionally want the flexibility to help my colleagues while AFK.
In the end, the above advice is very popular, but I just see a jaded burnout mercenary in a company with tens or hundreds of thousand employees.