[louis-lau]

Contacts and calendar are nice to have in the same place as email, because of needing to email contacts and because of calendar invites. Then again, if you use an email client you can use a mix of providers even for those features.

I'm not sure I see the need for any other additional apps next to email. Let alone the feeling of being forced to.

[yangcheng]

For example, when sharing a google doc in Gmail, the experience is more feature rich. And if an organization is already paying for gmail, it's hard to stop people from using gdoc and gsheet. In real work, I can't just reply a gdoc share with "use nino or I refuse to read".