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In all brutal honestly I think you just need to realize this is just you being upset at having shot yourself in the foot at some point (don't worry, we've all done it) and then trying to blame it on closures somehow, in this case by saying this makes them a "less useful abstraction". In all honesty, no, it just doesn't. It makes them more useful. If I can make an analogy, it's a bit like saying bicycles should only have fixed gears as a "safety net" because you've broken or slipped your variable gears in the past and now you've just learned to take a car or train if you want to go faster than first gear. I mean, that's definitely one way to live your life, but most people don't do it that way... they just realize their mistakes are a natural artifact of being in the learning process and instead of abolishing gears, they keep practicing more so that they eventually get the muscle memory to use their vehicle properly and don't have to think about this problem every time. That's the way to solve the problem for good -- so you can avoid the downsides while reaping the benefits at the same time.

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