It is obvious, but it’s also very time-consuming. You can’t solve ambiguous open ended problems in a set amount of time while being watched closely.
In the best case applicants needs to apply multiple companies. Companies need to interview multiple applicants and have a way to compare those applicants.
Those are the most basic constraints I can think of. How do you make that cost tens of hours for each round?
For me as a job applicant even in the best case I would need to do 3 to 5 interview interviews. The same is true for companies in the best case it will take at least 3 to 5 interviews to find somebody. Are they supposed to have 3 to 5 temporary staff for weeks at a time?
How much time should that take per interview? How would somebody that currently has a job manage that kind of time commitment?
What changes to expectations are you talking about?