[cytzol]

> From what I seen, the buttons didn't change

It replaced the Send And Archive button that lives next to Send. (Adding a new one is still a bad idea, imho, but would have been borderline forgivable)

[raverbashing]

Mine just says "Send", I don't remember seeing a "Send and Archive" button

[icebraining]

You can enable/disable it in the settings, maybe you have it disabled?

[hudell]

Send and Archive is my default button, which is triggered when I press Ctrl+Enter on a reply.