[laut]

They might have more resources, but they also have constraints. For instance a tzdata update was just released yesterday. Apple has a lot of resources but I don't see an updated from them today on iOS nor Mac OS X. Elixir tzdata automatically updates to the new version.

Does Apple even have resources that work on tzdata code? Or do they just use open source code?

I wrote more about the issue here: http://www.creativedeletion.com/2015/12/03/timezone-updates-...

In particular for Elixir I trust the time zone data from Tzdata more than for any other language, mostly because I know it is designed to have up to date data. (And well, I know the code because I wrote it myself.)

Even if a system is good in many ways it does not matter if the data is not up to date.