Classes (or structure types, at a lesser degree) provide a language supported way for you to model your problem domain. What is a Customer? What is an Order? What are the possible states of an order? What actions can you perform on them? Go to those classes and read it up.
There is one place with the authority of defining each of those concepts. All places in the application that use those classes need to conform to it.
If you use associative arrays or dynamic objects, this central, authoritative, source of truth disappears, and now you need to carefully read all code dealing with some object to figure out what they do with it (which 'fields' they create, which kinds of values they assign, etc).
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Classes (or structure types, at a lesser degree) provide a language supported way for you to model your problem domain. What is a Customer? What is an Order? What are the possible states of an order? What actions can you perform on them? Go to those classes and read it up.
There is one place with the authority of defining each of those concepts. All places in the application that use those classes need to conform to it.
If you use associative arrays or dynamic objects, this central, authoritative, source of truth disappears, and now you need to carefully read all code dealing with some object to figure out what they do with it (which 'fields' they create, which kinds of values they assign, etc).