Aside, from what the other poster mentioned, one major advantage is that I don't want to write getXXX and setXXX, everywhere where I do need computed properties

Aside, from what the other poster mentioned, one major advantage is that I don't want to write getXXX and setXXX, everywhere where I do need computed properties, does it matter if the value is precomputed or lazy computed (for example for a float derived from another float)?