Jason Moiron, a Datadog Software Engineer, discusses the inefficacy of using Go's `ioutil.ReadAll` function, arguing that relying on this function is often a programming mistake due to its inflexibility and inefficient memory usage. He highlights the advantages of using `io.Reader`, which offers more flexibility and better memory control, especially important in environments with limited memory and highly concurrent processes. Moiron points out that many data sources exceed the memory capacity of most computers and that streaming data can be processed more efficiently without waiting for entire datasets to load. He observes that the programming community tends to overuse `ioutil.ReadAll` despite the superior capabilities of streaming APIs, attributing this to the simplicity of byte slices compared to abstract streams. Moiron encourages the Go community to adopt better practices by identifying and replacing unnecessary uses of `ioutil.ReadAll` on platforms like GitHub, which would enhance code quality and benefit the overall ecosystem.