Apple keeps the web second-class on iOS
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If anything we should have more review process around these and make accessibility and latencies hard requirements and not optional.
That said, web standards have become super convoluted and hard to implement things consistently. If anything we should aim to reduce this complexity and slow it down a bit.
Not only that, but the browser is so insanely full of bugs, with race conditions, keyboard that won't show up if you press the address bar (requiring people to quit the browser), scroll that isn't always working and so on. The amount of strange bugs are really impressive.