> Did anybody liked writing data migration? Try explaining value of table migration to some Product Manager of early startup :-).

data integrity isn't good enough for a product manager? It's like saying "statically typed languages aren't worth the effort, do everything in JavaScript".

Furthermore, MongoDB or not, an application in development needs DB migrations. I don't believe one second you can change all your classes or structs and pretend like MongoDB will magically update your previous documents and collections to the current state of your application.