The reason for the appearing/disappearing send to device icon is so that the rest of the icons fit on the toolbar in smaller screens.
Think of it as an interface with modes, like the famous text editor Vim (which was my inspiration for this design).
And I'm not sure what you mean by adding space between the icons at small sizes. If you set the text to always appear and the icon size to small, the buttons width will be set by the text.
As for having no icons, I'm reluctant to do that as then there will be people who manage to hide both the icons and the text and have no way to get them back.
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