I think adversarial is the right word for the current style of tech interviewing. It wasn't always this way. Back in the 80s when I first got into tech it was a lot more conversational and in the spirit of "we really need help, what can you do for us?".

I think something more akin to a thesis defense would be better than what we're doing now. Prior to the interview have the candidate write up a description of a project they worked on and particularly liked along with a set of slides. Have the candidate send this presentation to the main interviewer who will distribute it to all of the interviewers. The interview then becomes a presentation where interviewers can ask questions about the presentation. I've seen this done in industry, but it was only when we interviewed folks who were PhDs coming from academia - I don't see why we couldn't do this for all kinds of candidates, not just those coming from academia.