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> People generally limit the number of roofs to one, as they are expensive and important for keeping the outside out and the inside in.

What does this mean?

And why is it the worst place to put solar panels? Is this and America only phenomenon, cause in India people are installing them like hot cakes on the roof. What’s different about roofs here?

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Your roofs are (often) concrete flat roofs with structural floor

The American roofs mentioned are typically significantly inclined, made of a less rigid material (wood, asphalt shingles), and not built to the expectations of supporting as much.

When OP says 'the worst place' they mean it is not a structural place, it is hard to access, and it serves an important function that is best not to mess with.

Note, I do not fully agree with OP but I get the points made.

American roofs are not built to mount anything but lightweight shingles, generally. They need to be designed for the load. Even if you do that, you now have a maintenance item that requires being on your room to perform. The correct place for solar panels is the many, many, many millions of square miles that don't have houses on them.

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