The new charging mode is way cheaper for them, and for their users. And way more convenient too. I really like the magnetic part of MagSafe, but everything after that sucks. The wire the MagSafe uses is really susceptible to being frayed at both of its attachment points, and the power brick itself is expensive (>$100). It looks like the new power brick thing is similar to an iPhone's, and uses a detachable USB-C cable. I presume the cable and the bricks will become fairly commonplace. And that means way less work in the long run.
Are they actively trying to piss people off by removing key features?
What is the advantage of this?