That's false equivalence. GDP being gameable does not mean the metric has anything to do with how valuable the output of each individual worker is, yet the metric suggests the opposite - if you made a metric like 'Number of Nobel laureates per large bodies of water', that would imply the presence of large lakes somehow aids or hinders top-tier scientific research, which is obviously a false premise.

My only argument is that both metrics are gameable in a way.

> if you made a metric like 'Number of Nobel laureates per large bodies of water'

That's a strawman argument.