> There is no excuse for every government in the world to not be covering every bit of rooftop or scrap land with solar.

is it intentional hyperbole and you mean something else, or are you making exactly this kind of claim?

because there are many many caveats to add here (even if we go with plan that specifically governments should be doing it)

For start: land with legitimate environmental protection, land where connecting power would be ruinously expensive, area likely to be destroyed by floods and landslides or scheduled to be overbuilt and so on...