If I understand your application architecture correctly, thenI would suggest doing the opposite as you found in your searches.
It is always better to have all your data centralized in a single data store with some sort of RDBMS such as SQL Server or Oracle, or even the latest version of MySQL. It's better for data integrity and better performance.
You are right, this conversation could go on at length, so hopefully others will start to add to this discussion.
Managing Technical Editor