There's also the loss of some connotations and nuance when the next euphemism comes in. The loss of the connotations is often the whole reason for the euphemism

There's also the loss of some connotations and nuance when the next euphemism comes in. The loss of the connotations is often the whole reason for the euphemism, but ideally you'd keep both words to allow describing the thing with/without the connotation.