I dont think every body can get subsidies. subsidy is an aid given by the government to the needy people who are not even in a stage to help themselves. Loan is which is got by people who are in need of money and which should be paid back.In most cases, loan is given based on collateral security provided by the loan appliers, whereas in case of subsidy no security is needed.
Yes you are right loan is not included in the subsidies. But I want a little confirmed that subsidies should not be for the poor, it may be more appropriate is for people in need because it in a broader sense. Loans are basically must be returned to the maturity that has been determined, and usually there is no guarantee or interest, while subsidies are given voluntarily and there is no guarantee or interest (usually coming from the government).
Answering the question from OP of why we need a loan, namely because there is an urgent need that must are met immediately so that we do loan. And must be returned with the specified time period.
Subsidies are not reserved for poor only. In fact largest receiver of subsidies are large corporates/business. Whenever any authority(local/state/national) want to implement any new project in their region then they offer large amount of subsidies to the businesses/corporates to establish there plants. These subsidies are in form of no tax or lowest possible tax, low value infrastructure that includes land, electricity, water, man power, and so on.
Ordinary well to do people are also eligible for the subsidies if goverment wants to implement certain policy. Like in some countries provident fund(retirement fund) installments are half paid by govt and half by employee. Just an example. In govt want to get certain crops then they would give subsidies For farmers too.
So subsidies is available for all. You just need to know the applicable scheme.
Lending Loan is something banks love to do. (Lending loan is in fact most loved by the loansharks though). They get major business from that. I don't think why loan is required needs to be explained. loan or subsidies have their own place in economy.