If you want to be kind to your users, allow them to scroll through the entire form, see it on one screen and ideally skip ahead without filling out required options but block submission.
In what sense?
I suppose for me it kind of matters how many questions are being asked. I'm fine with this UX if it's a specific question or two, but for a whole questionnaire with 14 questions or more, then I'd also prefer to be able to get an overview first.
> In what sense?
You just answered your own question.
I want to see what I'm getting my self in for so that companies/entities can't trick me into filling out a questionnaire with 50 questions in that, "Will only take a minute!" It's easy to get people to get answer enough questions that they reach the point that stopping now would mean everything they've just done is a waste of their time, so they keep going. It's abusive.
Give me everything up front and let me decide if I have the time to commit to that.
Well, I answered part of it ("Fine if short form, annoying if long form") but you seemed at first to find it aggravating no matter what.
Yeah, tricking people into thinking something is short when it's actually long is obviously shitty, no matter the approach.
Not the case here though.