I would say that development of JSON fields in Postgres and MySQL was accelerated by the adoption of Mongo.
Speed to market/first version using JSON stores is attractive, especially when you're still prototyping your product and won't have an idea of exact data structures until there's been some real world usage.
Speed to market/first version using JSON stores is attractive, especially when you're still prototyping your product and won't have an idea of exact data structures until there's been some real world usage.