Well, if you die of something else, these terms are not used. Or maybe I didn't see, but you don't say 'after fighting alzheimers' 'after fighting ALS' etc, they just say; he/she died of X. That feels more fair than taking some kind of process into account whereby one gets the feeling that if you had battled harder you would've come out on top. For many cancers this is simply not the case yet; I was 'lucky', he was not, but that's all it is. It has not much to do with fighting IMHO.