I realize this is an Xcode problem, but it is related.
Our team is in the process of switching most of our libraries from Xcode projects to SPM. However, as detailed in FB7724987, when a project importing these packages is set to gather code coverage from only some targets in Xcode, code coverage isn't actually gathered from them. It works for the same libraries, when they are imported as Xcode projects... so the only workaround we've come up with so far is to use generate-xcodeproj and then link these projects instead of the packages to get the code coverage.
I'd love for this to be fixed in Xcode, but I've pointed this out already during WWDC and it was said to be a known issue then... and supposedly under active investigation... no change since then.
So until this bug is fixed, I'd appreciate if this command continued to exist.