JavaScript boy and “lovely thoughtleader” 
he/him 
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In practice that's really the exception. Most people call JSON.parse and perform ~zero runtime validation on it; they just want to tell the type system what the expected type is. That's equally unsound between 'any' vs downcasted 'unknown'
It's only the exception because it's hard to do without a validation library, deficiencies in TypeScript refinements, and there not being a strong culture for it
[No one is doing this because no one wants to do it] seems like a self-defeating argument? The vast majority of JS code trusts the result of JSON.parse follows the schema the server said it would; very few devs want to ship client code to validate that the server isn't broken
What I'm saying is I want to do it, so I'm going to do it, and I will make it easier for others to do it, so more people do it, until hopefully everyone does it.
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