Async I/O - CON: I hate having to set up callbacks (even with promise syntactic sugar), whether I need them or not. But of course I do need them when I am co

Async I/O - CON: I hate having to set up callbacks (even with promise syntactic sugar), whether I need them or not. But of course I do need them when I am coding a U/I. PRO: the "promise-all" trick is pretty useful if you have several queries that all need to be completed before you can continue with their results. I have some Java code that might benefit from this since it does several queries to generate a PDF. (then again, caching might make this moot - YMMV)