They also did that for chat. When hangouts was replaced with "chat" chat moved to mail.google.com. Which means allowing notifications for email allows it for chat as well.
Huh? There has been chat in the Gmail web interface since before Google defederated from Jabber, although I believe it didn’t have notifications aside from changing the window title, for lack of browser APIs at the time.
Wait no. I'm thinking the other way around. It was chat could enable notifications for hangouts.google.com. But when it moved to mail.google.com now allowing chat notifications allows mail notifications, which I didn't want.
