One could not solve it.
Software dev here. Not all languages are on the same level. There are languages that are lower level languages closer to machine code (think binary). And there are upper level languages that build on the bottom ones to be more human friendly and readable. Generally lower level languages can be more efficient to run. But high level languages are easier to produce and iterate.
Even if you made a universal language, you’d still need a handful. And you’d have to shut the entire world down for years to update everything.
But the real reason? Someone can always make it better. And as needs evolve rapidly, so do languages.
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