I'm kind of curious what Alex meant by this, as the security problems relating to io_uring are, to my knowledge, unrelated to the user-space program. It makes sense if you want to disable the feature in your own kernel or remove potential sandbox escape attack surface, but it's like saying "You might want to avoid win32k if you want to use features with a good security track record" (and I know this is kind of apples to oranges but you get the point).