My experience is almost diametrically opposite on the first few things.
> Most of the speech in any conference around the world are just simple stuff that can be condensed in an hour
I have found that in majority of technical talks, an hour is thoroughly insufficient to convey everything in detail. This means, a good talk requires days of preparation, careful understanding of the critical aspects of the subject matter and building a narrative that joins all of them seamlessly.
It is incredibly difficult.
> Usually you could do the same in a 10 minutes session if you are targeting a more skilled audience
In my experience, 10 minutes is only good for elevator pitches. To take away anything of technical values, it usually takes 60 minutes or more.
> that is super hard to get people to work together doesn't matter what
That's why my mentioned running clubs/committees or being deeply involved a team sport. Those exact same dynamics manifest in the 2 scenarios and the skills obtained form there are to some degree, transferable to industry.
> What I find it useful is scenario base question like: last time you had a conflict in your team how did you handle that
I love these kinds of questions. Not because they always reveal anything important, but they play to the strengths of a good story teller.
Most people at this point, practice these questions just like leetcode. The interviewee doesn't answer your question, they fetch a meticulously crafted and appropriately fictionalized account of a past event, and the interviewer is none the wiser.