They're not slotted to the proper depth. What's the proper depth? There is no proper depth until it's strung up and all other fretwork is done. They can't go too deep because the strings will sit on the frets on some guitars. The warmoth neck I bought had the strings at about .030" above the first fret. I like my strings at around .015" - .022" above the first fret. And it's crazy the difference it makes in feel, comfort, and playability. So yeah. The nut will be cut and you'll be able to string it and play it, but being able to drop the strings to your preferred height really takes it over the edge. You may prefer them higher and the warmoth nut may already be too low. It's really all personal preference.