Imagine you inherit a COBOL codebase, would you expand it further or would you try to add a functional microservice in the language of the day?
Ok, you can say: the codebase is not COBOL, is C and is beautifully done. However all architects studied Art History and Aesthetics, so, at least, they have a more informed opinion on what defines a good codebase than a layman. Probably we could give them the benefit of the doubt.