We're talking about JSON parsing here: a solved problem. Do those companies write their own JSON parsers? I don't think so.
The level of arrogance to think we know better than the developers working at a company on what they should / shouldn't write is astounding.
Nike doesn't need to justify anything to any of us, though as someone who writes apps using Swift, it looks distinctly different from other JSON parsers. I'll explore using it in a future project.
Thanks for contributing to open source, Nike!
Somewhat prevalent here on HN, I've noticed. Middlebrow dismissals and condescending comments that fail to consider context seem to be even more regular than normal lately, though that's probably just my mind playing tricks on me.
Solved for your use case(s), you mean. You're saying that you cannot imagine a reasonable circumstance under which off-the-shelf solutions wouldn't fit your needs? (Hint: if you write code for a living, this very scenario is why you have a job.)