Just had this explained by a good friend / media scene veteran….
Dinner means you really want a relationship, a deal or both.
Lunch means you’d like to get to know someone to see if you want a relationship, a deal or both.
Breakfast means you’ve got a current deal to discuss (if you already have a relationship) or you’re willing to consider a relationship with someone new, but that person isn’t especially important.
Drinks are for friends or business people who have become friends.
Coffee is not even on the spectrum.
Update: Jeremy weighs in and says “Disagree. Breakfast is the new lunch.”