pprof is an important part of the Go programmer's toolbox. Perhaps we should promote it to a direct subcommand of cmd/go, rather than via go tool. This would also let us provide a nicer help message and nicer flags for the most common and difficult to remember pprof command line flags, such as -sample_index=inuse_objects. The full pprof experience would still be available at go tool pprof, for scripts and muscle memory.