Any business problems that can be shown, objectively, to be better solved by one paradigm versus another can also be isolated into its own code base/module wher

Any business problems that can be shown, objectively, to be better solved by one paradigm versus another can also be isolated into its own code base/module where said paradigm is canonical and ubiquitous. The problem is, this rarely happens and with a language like Perl and Java you end up with a mish mosh of hard to reason about code bases because the authors at the time were just trying to muddle through as best they could with whatever approach resonated with them.