Earlier quoted context omitted.
Because Apple don't provide these package management tools, volunteering third-parties do. Apple are never going to provide Linux-style package management tools because the market for them is minuscule compared to Apple's real market: normal people. For normal people, there's the App Store.
Developers aren't "normal people" then? If that's seriously the attitude Apple takes towards its developer community ("no, we won't give you the software you need, get it from the crappy community projects") then why do you put up with it? It seems like the OP's point is pretty valid to me. I use an OS that gives me what I need to do my job.
No. They aren't. Developers have needs far greater than that of your average everyday user. Apple sells a machine that is the best possible for the greatest number of users, and doesn't really cater to niche markets. I don't get what's surprising about this.