When it comes to correctness, only the result matters, sure. But not so for performance and code understandability. Obscuring points of arbitrary code execution

When it comes to correctness, only the result matters, sure. But not so for performance and code understandability. Obscuring points of arbitrary code execution is awful. The getter/setter pattern is also bad, but a little less so since it's exceedingly rare any real code will get executed there.