That seems orthogonal to me: is adding a network boundary really the only way to enforce basic software engineering practices? It seems just as likely that the same organizational issues would lead to e.g. learning that your data model is wrong and part of the app now needs to dispatch thousands of queries, and fixing this is harder than refactoring a couple parts of the same codebase.

(Note: I'm not saying microservices are bad – I just think that the process which lead to that ball of mud will unfold similarly with a different methodology)