I think it would be a great feature if there was an AI linked to MainType so that new fonts are automatically labeled based on their appearance (perhaps by using the Fox system etc.). Alternatively, there could be a database online where containing font names and their classification where MainType pulls information. This classification could then be converted into tags. This would save a lot of time.
Possible problems: fonts with the same name: User could be asked if his font matches the researched font attributes for the name in the database