Xcode on iPad would look great and possibly draw many more professional app devs to the platform. But I just can’t see myself ever trying to develop seriously on an iPad.
I do primarily web development. With tools like Visual Studio Code Remote (see Github Codespaces), I can imagine a future where I run the code editor in Safari; the issue almost always comes back to debugging and dev tools, and I don't see those coming to iOS any time soon. :(