A phone that is a few years old doesn’t have the energy/battery requirements that new phones have because of a more memory hungry operating system that requires a beefier cheapest, more memory hungry cellular chipsets (5G), Google Services, etc.
And if a company can’t sell a phone profitable, it’s not a viable product.
And he admits that he hardly ever uses it.
And that phone will probably not work at all soon in the US if it doesn’t support VoLTE.