As a user I only want to know about a feature when I need it. I don't want a tour or of the blue! I want to do the thing I came here to do. It's very unlikely that your new baby feature is the thing I want to use right now.

This is why I love command palettes. It allows me to discover features by searching for them. When I've searched for it - then allow me to take the tour of where to find it faster/more conveniently and/or show me the shortcut key.