A little disappointed to see that they're still shipping Ruby 2.0; a version shipped 4 years ago. I would hope that they would update this soon to keep up to date with the language and security patches
Never expect Apple to ship anything recent. Anything outside of their own "core system" that depends on 3rd party packages is likely to be 2, 3, 8 years out of date. Software like brew and macports aren't only popular for "extra" software; they're popular for replacing bundled software that is severely out-of-date. Last time I started from scratch, that included updating git and php from versions so old that it was laughable. Let us be thankful that these alternatives exist.
Just to be clear, though, this isn't because Apple isn't interested in updating things. It's specifically because much of that software moved to GPLv3, and Apple won't include any software with that license. (The internal documentation is very clear about that haha.)
It’s been a long wait, but High Sierra should ship with ruby 2.3 in under two weeks. An August beta came with ruby 2.3.3p222.
They tend to not ship anything except for security patches for each macOS release, hence it's unsurprising that Sierra is on 2.0.
Worse than that is all the GPL-licensed stuff, which are stuck in 2007 because Apple has a vendetta against GPLv3