It doesn't really seem like there's much utility in defining it. It's like defining "heaven."

It's an ideal that some people believe in, and we're perpetually marching towards it

No, it’s never going to be precise but it’s important to have a good rough definition.

Can we just use Morris et al and move on with our lives?

Position: Levels of AGI for Operationalizing Progress on the Path to AGI: https://arxiv.org/html/2311.02462v4

There are generational policy and societal shifts that need to be addressed somewhere around true Competent AGI (50% of knowledge work tasks automatable). Just like climate change, we need a shared lexicon to refer to this continuum. You can argue for different values of X but the crucial point is if X% of knowledge work is automated within a decade, then there are obvious risks we need to think about.

So much of the discourse is stuck at “we will never get to X=99” when we could agree to disagree on that and move on to considering the x=25 case. Or predict our timelines for X and then actually be held accountable for our falsifiable predictions, instead of the current vide based discussions.