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What's interesting about this discussion is that a lot of people found this to be very upsetting, and twitter blew up with discussion about typechecking. We saw the exact same thing happen when the ESLint team announced they were not interested in using TypeScript for their rewrite of ESLint, but instead were choosing the same approach the Svelte team is going for; plain JavaScript with JSDoc for typechecking. In these twitter discussions it has become very clear that lots of people, even some of those who call themselves "educators", don't understand how capable JSDoc actually is and will unfortunately just spread blatant untruths about this way of working.
Skipping a compilation step, in the context of TypeScript usage, has several benefits. It makes your code runtime agnostic; your code will run in Node, Deno, the browser, Worker-like environments, etc. Some of these environments, like Deno, support running TypeScript natively (which has a whole other set of worrisome implications). Some of those environments, like the browser, don't (not until the types as comments proposal lands anyway). This may or may not be an issue for you depending on what you are building, but again, some people find this to be preferable.