Why would you care about economic growth in absolute terms instead of productivity per person?
Because wealth isn’t evenly spread and those that beat this drum are on the wealthy end of the spectrum.
Which is exactly what is happening. By every metric imaginable the entire population of the planet is gaining in wealth. Some quicker then others. But gains are largely universal. Poverty is at it's lowest point in all of human history. And in a month it'll be even lower.
Also when wealth goes up, overall consumption as measured by actual natural resources consumed goes down. People have this misconception that increased wealth equals increased consumption, which is hardly the case. Wealth represents a increase in well being, which more often then not, is a result of increased efficiency.
By 'increased efficiency' I mean less human effort is required to produce more with less.