> The positional order seems like it would be easy to work around if they allowed you to pass in a key. Not sure why that isn't available.

IIRC it's because they implemented their own method lookup table (!) to associate with the Component object (!) but as a FIFO queue, more or less. I assume either for ideological (that's how they wanted it to work) reasons or because they (probably correctly) reasoned that loading down React apps with more strings at such a basic level would risk performance/memory problems. Plus if they did that then it'd really look like a method lookup table and be more obviously Rube-Goldbergian than it already is.