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I don't know what accessibility tools you're thinking of. If you mean assistive technology software like screen readers and voice control, yes, too often they fail to do what they should even when web standards are followed but at least as often the fault is with the web browsers (assuming the page code is all technically correct).

I'm not aware of any accessibility reasons to not simply use a <dialog> element for dialogs. For it to be a modal dialog, it must be opened using the `.showModal()` method or the invoker command `command="show-modal"`.

The hack of needing to implement roving tabindex techniques is not due to the failings of accessibility tools but because of web standards have not yet provided an alternative (adding the `focusgroup` attribute to the HTML standard is in the works).