Can you elaborate on what's missing? I do a lot of graphics work, and their macOS debugging tools for OpenGL were terrible, but the ones for Metal (which came out first on iOS) are pretty cool! I also use Instruments a lot and some of the other more esoteric tools supplied with Xcode. Not to mention the static analyzer, Address Sanitizer, and lately the Undefined Behavior Sanitizer. But I'd love to have even more tools! What else is out there that they don't supply?