Accommodations just provide optionality, and let’s people choose the approach that suites them best. Rather than assuming that you can fairly apply some rigid standardised test on people, and expect it to accurately measure individuals. There’s plenty of data, and some pretty basic stats, which show this doesn’t work.
Proving extra time provides almost no advantage to anyone. Either you can answer the questions well, or you can’t. The amount of time it takes to do isn’t very relevant, so taking more time isn’t an advantage.
Providing questions in advance also isn’t an advantage. Again you can either answer them well or not. If you’re worried about people cheating by passing the questions around, then only provide them an hour or two in advanced, or only once they’re onsite.
If you’re interview process can be fooled by giving people more time, or advanced notice, then quite frankly it’s not a very good interview process.