If you're working in an environment that categorically requires all high-level concepts (say, iterating over a collection or representing mutually-exclusive data) to be encoded using low-level mechanics, your productivity will suffer.
But don't be confused: this is not the lost productivity of a missed optimization. We're enabling orders of magnitude of change by giving the developers tools for thinking rather than a mere code to grunt at the machine.
But don't be confused: this is not the lost productivity of a missed optimization. We're enabling orders of magnitude of change by giving the developers tools for thinking rather than a mere code to grunt at the machine.