Why do build in Generic z-wave driver have no MeterReport support?

Can you be more specific about which devices you’re referring to?

There’s been lots of discussion in the forum for years about z-wave power reporting, and not just limited to custom/user-created drivers.

In fact it’s such a big topic that the staff have created special posts just to inform users about it. See, for example:

Isn’t this a WiFi device?