I'll second @viraptor and @hops answers : It is the same cause as the rise of microservices and DevOps adoption, easier politics. I worked for a big old company

I'll second @viraptor and @hops answers : It is the same cause as the rise of microservices and DevOps adoption, easier politics. I worked for a big old company, and most of the problems were political and administrative. One big SQL database is quite efficient until the entity that owns it does not agree with the new CTO strategy and any another critical part of the business. Add an incident that shows the low resilience of the model and it quickly becomes a political headache, while the technical solution still seems evident to everyone.