The difference between other Dev tools and GitHub is the difference in probability of getting things wrong. Like when intellij types out boilerplate or a compiler generates code it's 100 percent correct and if it fails it fails predictably. Copilot is often complete garbage and there's no guarantee of correctness or failure mode. I cannot trust such tools for anything serious. If you're in the habit of copy / pasting code from the internet then I can see why it might help speed that up. But imo that too is dangerous and I avoid it unless absolutely necessary