I don't like these questions at all. My initial reaction to these is: Why do you insist the candidate reads your mind? Some of the questions can be useful if rephrased to not require mind-reading the best range of answers.

The purpose of the interview for the interviewer: deciding between "no, don't hire this person", "maybe, we'll decide later with more data or after comparing with another person", and "yes, hire".

The purpose of the interview for the interviewee: deciding "yes/no, I want to continue with this company" and conditionally if yes trying their best to get the interviewer into the "yes, hire" state.

I'm only going to pick on one of these questions, but they all have the same problem in that they're not (to me) very effective means at fulfilling the purpose since they'll select for candidates most capable of reading your mind, not actually really useful candidates. When you ask "what's your take on accessibility on the web?", the candidate is thinking many things at once. Here are some: 1) do I have a take and what is it? 2) what's the answer the interviewer wants to hear? 3) if my answer is wrong does that make it impossible to get into the "no, don't hire" state? 4) will I know once I answer?

Maybe you want a take that says accessibility is important despite the added costs, because humanism or whatever. If they say accessibility isn't important, because the costs don't justify it, you put them in the "no" bucket. Or perhaps it's vice versa, or you analyze the issue through some other framework. Maybe you really just want to see if they can converse about it at all, and will devil's-advocate the opposite of what they say, and only put them in the "no" bucket if they can't converse or start screaming at you.

In any case, I don't think you're being fair to the candidate and you're likely wasting time. If you just want to test ability to converse, and don't actually care what they personally believe, state that in the question and don't ask for their actual belief: "I'd like to have a sort of philosophical discussion with you about accessibility on the web. Let's imagine I ask you ... and you feel ..." If you actually have a specific range of answers in mind that can put someone in the "no" bucket, put that information in the job description requirements. "Expected to design with accessibility in mind." fits the first of my maybes, "Expected to move fast and not spend time on non-MVP work like accessibility." fits the vice-versa. Presto, no mind games, no wasted time for everyone because it wasn't clear until you asked your question that you hold opposite views and thus this is a "no". Maybe you're worried about liars, which you have to be anyway since plenty of people apply to coding positions without being able to code, so you might ask a more specific question (like we do by asking them to code something) around accessibility that makes clear what conclusion you expect (it matches the job description) and that you're looking for some sort of reasoning for why that conclusion is such in their mind.

Maybe since you're mentioning "end up being really useful" (as opposed to just useful) you don't weigh answers to these questions as hard "yes" or "no" filters, but just "maybes" that you can subjectively reflect upon later (e.g. by adding up a bunch of "maybes" you've recast to point-weighted soft yes/nos that can cancel each other). Fine, you can still put "Bonus:" in the job description, rather than "Required:", so that candidates know ahead of time that if they can only get to the "maybe" state the presence/absence of those certain "Bonus" attributes will influence their chances of moving from "maybe" to "yes". If they're already uncertain about "yes", and see a lack of "bonus" attributes on top of that, they're likely to not bother, again saving everyone's time.

It's fine to distinguish between "really useful" and "useful". Questions that can distinguish between degrees of "maybe" between candidates aren't bad, but they should be back-loaded as much as possible, and only used when the front-loaded yes/no questions have been asked and you're still in a state of uncertainty about which candidate would really be better, lamenting that you only have the budget for one of them. How many of those do you get?