At least part of this is the decentralized/complied nature of a FOSS operating system. You don't get a command called grep because someone making design decisions about a complete system holistically decides that tool should be called grep. You get it because some random programmer in the world needed a way to find patterns in text so they wrote one and that guy called it grep and someone else saw utility in packaging that tool with an OS. It's a patchwork, and things like this are a culture of sorts.