I infer that the stranger is suspicious i gues
To cast down your bucket where you are means that you don't need to travel far in order to find what you are looking for - there are many valuable resources exactly where you are.
What Washington is trying to say here is that he wants both black and white people to work together and rebuild the South in order to make it prosperous and forget about their differences.
Answer: the disadvantages are that you are still on a screen regardless of what you are doing. Additionally, depending on the app it could take up additional space on your phone which isn’t exactly a good thing.
Explanation: while on the contrast, the advantages can include motivation on working out to become the best version of yourself.
Or maybe it could give you tips and motivation on how to become the best version of yourself.
