Because every.single.one of these "integrated environments" I've ever come across was an objective mess, poorly documented and littered with tech-debt.
It was clear the "20-year SA" had forced 20-year old administration abstractions and ideas on top of modern infrastructure and application concerns. It was cheaper/better/easier to throw it out and rebuild on something like k8s than to make any attempting at "scaling" the existing solution.
You're simply trading the "in-fashion" disease for the "I'm a 20-year Linuxbeard I know best and no one tells me different" disease.
