A car isn't a computer, so that analogy doesn't work.
But a Mac and a phone are both just computers. The iPhone isn't a phone in the traditional sense in the same way the MacBook isn't a traditional book.
Both a Macbook and an iPhone have processors, a screen, a battery, memory etc. But if my Mac has no connection to the net, I can't load Google Maps. It's useless in that sense. But I'm able to download the maps onto my phone.
If there's no wifi, my Mac can't check emails, browse the net etc., but my phone can.
Why doesn't the MacBook have a fingerprint sensor?
Everyone so far has just got petty and defensive rather than answering a simple question.
OK.
1) Cost for Apple. Adding more stuff = more money.
2) Need. With Wi-Fi hotspots everywhere, and tethering fully available from phones, the requirement for a 3G-enabled laptop is far,
far less in 2015 than it was in 2008. It's a very niche market.
3) Cost for the consumer. A 3G-enabled laptop would mean an extra SIM card. If Apple brought that out, most people here would rightly ask: "why the heck do I need that? That's ridiculous. Why not tether to my phone, I've already got a SIM card? Apple are losing their vision. Tim Cook? More like Tim
Crook, am I right guys? What happened to the Apple I knew?"
4) Fingerprint sensor is doable on a laptop. Lots of patents about fingerprint sensor on future trackpads and things like that. But you just need to type in a password at the moment, it's not the end of the world. Plus they have properly good encryption on the Mac. There's Find My Mac. Lots of great security features that you seem to be disregarding in the argument. Again, with all that, the
immediate need for a fingerprint sensor is slightly dampened. I have no doubt Apple are looking into this, though.
5) It needs to work. I think this is the main problem. If Apple released all this stuff, but it was half-baked and didn't work right, you'd be the first to complain. If you had a fingerprint sensor, you'd need it to aesthetically go with the MacBook's visuals. You'd also need to
ensure that it would never wear out or have problems down the line. They could be testing one now for all you know.
With Apple, they concentrate on doing
less things, but ensure it works. Your argument is very synonymous with the touchscreen on OS X argument. Without a heck of a lot of work, it's nothing but a gimmick, that at the moment really isn't necessary or beneficial for 1% of consumers.
There are plenty of laptops out there that have what you want. Apple don't pander to doing everything and anything that can be feasibly done. It would be best to buy something else that is better suited for your needs.