I doubt it will come as a surprise to anyone that X was fundamentally ill conceived from the very beginning. It’s one of those unfortunate side effects of unintended consequences that Unix history saddled us with it for twenty years longer than we’d ideally have wanted.
It fascinates me that something so widely regarded as Bad and Wrong, proved so hard to replace when it’s baked into a system. I think there’s a cautionary tale about the necessity of getting your core APIs right, because you might never be able to get rid of them.
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