The point isn't that everyone needs to write the same code manually necessarily. It's that an author could easily just combine the entire tree of seven line packages into the one package the create-react-app uses directly. There's no reason to have a dozen or so package downloads each with seven lines of code instead of one that that's still under under a hundred lines; that's still a pretty small network request, and it's not like dead code analysis to prune unused functions isn't a thing. If you somehow find yourself in a scenario where you would be happy to download seven lines of code, but downloading a few dozen more would be an issue, that's when you might want to consider pasting the seven lines of code manually, but I honestly can't imagine when that would be.