But why does it still have a headphone jack?
This might be seen as a troll / joke comment but I think it is a good question actually.
One way to look at it is that it is very inconsistent to continue to offer this legacy port when Apple clearly wants people to move to Bluetooth or USB-C for all of the things.
But another way to look at it is this is one of several customer-oriented compromises made on this machine that have been surprising to people: a lot of people still want a headphone jack, it is easier than an adapter and dongle.
So this could be grouped in with making the batteries replaceable and offering Touch ID without the loathsome touchbar. And more broadly that the company is softening somewhat with what many people felt was a dogmatic approach to design over functionality and port progressiveness over practicality.
For me personally, I'd prefer it have been a 3rd USB-C on the right side. That would have been much better for my purposes.
Edit: Another way to look at this is that if the next Macbook is ARM and all USB-C on both sides--this older machine will serve as a true workhorse for some time for people who really want or need x86 and at least one older port. With the more easily replaceable batteries, the 2018 may be in use for a lot of folks in 2026.
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What I don't understand is why TouchID was not added to all of Apple's laptops 5 or 6 years ago when it debuted on the iPhone. Seems to me that Apple missed the opportunity to cash in on the hype of what was then a brand new and very helpful technology.
Good question.
For one, I think Apple uses specific features to drive sales of very specific products. You see this on iPhone where iPad doesn't get the newest stuff until long after it has been on the new flagship iPhone.
But I also I think Apple spent a lot of time trying to decide whether they would support the touchbar and tether touch id to it or not. And also, whether Face ID would usurp Touch ID and how to time offering that in laptops instead.
Regardless, I think after a difficult decision process they are dumping the touchbar. I think we'll see a new magic keyboard next year with touch ID but now TB in it.