While I understand what you're saying, I think the distinction is useful because "takeout" has more of a specific meaning and association with more 'casual' foo

While I understand what you're saying, I think the distinction is useful because "takeout" has more of a specific meaning and association with more 'casual' food. Whereas these 'delivery only restaurants', or 'dark kitchens' are existing restaurants that people enjoy, but with an offsite, delivery-only location.