[intended]

??

This is taking the edge case and extrapolating it over the rest of the curve of possible activities.

Maintenance and repair are a subset of all business and economic activities. AFAIK its a subset of GDP calculations.

The rest of the value additive portions of the economy are captured, which is what GDP is supposed to roughly reflect.

Further, if there was a spurt of such activity, such as an earthquake - GDP output would fall, because now while work is being done to repair things, profits from more valuable actions such as making high margin products stops.

Your GDP growth rate, for that year drops, if not total GDP output, because now effort and energy is being directed at maintenance and not wealth creation.