Further: by defining the criteria under which a condition becomes medically treatable, other parts of the healthcare system, such as insurance (private or government-funded), treatment protocols, and the like, come into play. Individuals should they choose to seek treatment are then able to do so within a much larger system.

By making the criteria reasonably loose and readily met, such a definition also minimises the number of individuals who would benefit from treatment who are excluded from being able to do so. This would include those who are very much unable to function or face larger grief-related risks.

We medicalise grief not because we fear it, but because there are genuinely useful therapies which may be of use to some, and denying them that merely compounds suffering.

And yes, absolutely, grief ultimately is a lifelong experience. You never stop missing that which you've lost, so long as you have the capacities of memory, reason, and feeling. That is not what the clinical definition is about.