A better rat trap improves the lot of low Hindu caste

This is a great thing, and it's wonderful how they're embraced it, and it's making a difference.

But it makes me wonder: what prevents people from coming up with such inventions on their own? Is a lack of raw materials (steel)? A lack of technical mechanical engineering expertise? A lack of an inventive mindset? It seems there are so many problems out there that could be solved, with a little effort and ingenuity sustained over time.

Actually, I think it is probably as simple as when you are struggling to find your family's nest meal, you just don't have the capacity to invent. Not the spare energy, not spare resources, not resources to invest in learning - and no buffer to make it reasonable to take risks. What's my excuse?