[frowaway001]

> you're still iterating over the list twice

There is nothing about higher-order operations that would require developers to implement xs.map(...).map(...).map(...) or xs.Select(...).Select(...).Select(...) or whatever as multiple traversals over the data structure.

> The problem with the fancy syntax is that it makes it too easy to write suboptimal code that you'd never write if you were writing plain old for loops, like the above.

Maybe Google should just invest in hiring better people? I know it's getting increasingly harder to find people who still haven't evolved from the 1960ies mindset, but still ...