As a technical person who spent too much on wedding invitations at the last minute, I do think that integration with a printing company would be the killer feat

As a technical person who spent too much on wedding invitations at the last minute, I do think that integration with a printing company would be the killer feature. Moreover, I worry that launching without a printing service would be a business-killing misfeature. It sets the wrong tone (nobody wants to have their own invites printed) from which it may be hard to recover. I recognise the founder's desire to handle this in small chunks, but printing... I dunno, I wouldn't look twice without it.