You don't ever lose productivity or knowledge on a tool when a new one comes out though. A new thing that people like becomes popular and people start using it,

You don't ever lose productivity or knowledge on a tool when a new one comes out though. A new thing that people like becomes popular and people start using it, old one becomes less used but it doesn't dissapear. You only really "switch" to a new tool if that's what you like the most, not because that's what people like now.