It's not accidental that products get worse over time; it's because companies stop paying attention to them. They stop caring as much about maintaining the same quality they did when they were just trying to fight for survival and no one would pay attention unless they had the best technology.
When lab safety procedures aren't followed, people can get hurt or worse. Lab equipment and chemicals that are improperly handled can result in personal injury and even death.
Gujarat is a pro-business state, where civil society organisations are comfortable with working to make sure that business does not suffer. Large parts of the rest of India, for better or worse, are very different.
Well-designed subsidies help the poor make the best of whatever opportunities they have; poorly designed ones either do very little or actually make things worse for them.
The degree of political pressure to make MGNREGA jobs available varies massively from state to state - which is why access to MGNREGA jobs is worse in a very poor state like Bihar than in a richer state like Andhra Pradesh.