Getters are great for manipulating data on the way out. For instance, inside the class you might store a raw representation of the data like a json string, but

Getters are great for manipulating data on the way out. For instance, inside the class you might store a raw representation of the data like a json string, but when reading an attribute you will decode that json string into a datastructure and pluck a certain item. I use dynamic getters often to wrap a raw value with some kind of fallback: do this if no data is present, do this if the data is present but is ancient (ie a seamless upgrade of a v1 internal datastructure to a v2 output), etc. For setters, I try not to have implicit side effects but in certain cases where it makes sense, it is nice to be able to centralize that logic: "if this value changes, ensure x and y occur" which you get "for free throughout your codebase when you use a setter, versus having to go thru the entire codebase and sprinkle the do_x() and do_y() calls (which then becomes additional footprint to maintain and worry about)