alt Hacker NewsAn IDE, by name, integrates the development environment. Depending on target, development lifecycle usually includes writing code, generating binaries, pushing those binaries to the target, executing on the target, and debugging on the target; so an IDE includes editing, compiling, linking, device/JTAG drivers, and debugging, in my mind. I suppose for platforms without cross-compilation the device drivers vanish, and for languages without compilers and linkers similar; but at a minimum, development means both authoring and debugging code, and so an IDE must provide an integrated view of the debugging process.
Then that distinction doesn't match the original claim, that readability of unlabeled code doesn't matter, since we now have IDEs, as this is an orthogonal matter according to your definition.