somewhat related is the use and abuse of jsonb columns in postgres, these also get stored in toast tables and cause a lot of performance issues as opposed to when being stored in actual tables and columns (not json)
If you store large jsonb values in the database, storing them out of line may be a good thing - for example, you can query metadata much faster.
Also, worth mentioning that jsonb is only benefitial when you plan on indexing/manipulating the data in the database. Otherwise, using json type may be a better choice (smaller size, stored as text, parsed on demand)
