ARIA is a solution to a specific problem, not something that should be used on every site. HTML is accessible out of the box when semantic elements are used as intended. If you are using a div as a button, you probably aren't hand writing HTML. It is likely part of a library. Adding the necessary ARIA attributes benefits every site using the library. Your boiling the ocean analogy implies that every web developer needs to scatter ARIA attributes all over their code, which just isn't true.
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People post both articles and comments to HN. My comment pointed out that ARIA can't help with anything as ARIA is a boil the ocean approach.
ARIA is a solution to a specific problem, not something that should be used on every site. HTML is accessible out of the box when semantic elements are used as intended. If you are using a div as a button, you probably aren't hand writing HTML. It is likely part of a library. Adding the necessary ARIA attributes benefits every site using the library. Your boiling the ocean analogy implies that every web developer needs to scatter ARIA attributes all over their code, which just isn't true.