I bet Promise people will start using async / await for sync operations, fully not realizing that it'll take away any reasoning about code
If sync and async ops look the same, code that touches IO becomes indistinguishable from the rest - which means optimizing becomes harder
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The general approach to creating more efficient services is: 1. reduce IO, 2. do concurrency; if either becomes harder it's bad for perf
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With callbacks it's apparent which parts do IO, and which parts don't. If it's a callback, it's doing IO (or working around JSON.parse :/)
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