Earlier quoted context omitted.
apt-get is still the golden standard for installing apps on Linux because of its dependency resolution system, and being able to "sudo apt-get install " is a core use-case for end-users (i.e. students who are learning how to use Linux / code for the first time). Disclaimer: I work at Google, but not on Chrome OS.
Genuinely asking, what makes apt-get that much better than other package managers? Outside of Slackware I think good dependency resolution is pretty much universal at this point, and I can't say I've ever noticed any major problems with pacman, for instance.
It's been a while, but my understanding is redhat figured out dependency resolution too, though.