Yes collective code ownership generally produces the best overall outcomes. Individual developers or small agile teams need to be able to work through an entire vertical slice of the application to deliver a complete feature that has actual value to users. When you divide up the work by code module rather than by application functionality then the user's needs stop being the primary focus.
But with collective code ownership it's still useful to designate a couple of developers as "stewards" for each major component. They don't own the component, but they take responsibility for training other developers on the internal design, making suggestions on refactoring, and reviewing design proposals and code diffs.
But with collective code ownership it's still useful to designate a couple of developers as "stewards" for each major component. They don't own the component, but they take responsibility for training other developers on the internal design, making suggestions on refactoring, and reviewing design proposals and code diffs.