That may be simple trick for the db, but not when your paradigm involves importing files - imaging telling that to users, instead of giving json, please give 75 csv files.
This scenario might be more common than you think -- spreadsheets still reign supreme, and often 75 csv files is how the users have the data to begin with.
(Incidentally, my day job is building a spreadsheet importer.)
(Incidentally, my day job is building a spreadsheet importer.)