Why is a Gcode standard important???

Group,

There's been much discussion about what is "standard" and what is
not.

My questions....Why so much concern over standardizing Gcodes? Why
does it matter? Who is adversely affected by non-standard Gcode?

What about conversational programming? Why no efforts (to my
knowledge) to standardize that?

The machines themselves are not "standardized" so even with standard
Gcode they'll still perform differently.

thanks,

Doug