> What makes the CAS codebase impressive is the discipline of applying all of them consistently, across 400 modules, for years.

I think this is the main point. You can write good code in any language following this concept.

That's really the whole thesis. None of the patterns in the article are clever or novel - @ConditionalOnMissingBean has been in the Spring Boot docs since day one. What's hard is getting a team to apply it on every single bean, in every single module, for years, without anyone cutting corners. Discipline scales. Cleverness doesn't.