So is the iPhone. The basic reason for wanting to dispose of a headphone jack is that it to reduce the manufacturing cost of the smartphone. It makes the phone a little cheaper, and let’s sell wireless bud accessories for hundreds of dollars. Which is good.
And for many people, quality, durability, and latency variation will be a minor problem, meaning removing the jack, as long as you don’t lose your customers because of it, is a printing license (the risk of loss of customers is why many companies, especially at mid-range, have kept it) .
Even now customer has to use Lightning to headphone jack connectors to use the same, and many of them are already using the same and you can buy the Lightning to headphone jack from many online stores.
So why not a MacBook? A MacBook is a real computer, intended to get the real work done. And within the music and sound industry, the headphone jack is the standard of the industry, as it remains among the best options. Even USB headphones can’t match the headphone jack in terms of audio quality at this point.
So for iPhone there is a benefit, and for MacBook, it clears the market.