Bitcoin can be a useful tool, probably more at the international level of economic relations, but not for the people themselves, since people in such countries not only cannot afford the crypt, but also the Internet may not be accessible to everyone. And bitcoin will never replace the truly important reforms, education and infrastructure that are needed to fight poverty.
I see your points you made some good remarkes, You were on point some of the things,Bitcoin is a tool that can help with currency devaluation and combat inflation Some developing countries yes infrastructure and education are important to use Bitcoin, if you say affordability anyone can afford Bitcoin we are not talking about full Bitcoin, We can buy less than full Bitcoin, sure they can't afford full Bitcoin but they can afford 100th part or maybe 1000th part but they can afford, Yes internet is big concern for many countries but most of developing countries have internet today or in future they will Bitcoin is only thing it can help in just some specific sanario but there are more things that can help.