In over 25+ years at various companies, I only recall one interview where isolation levels were even discussed. Almost nobody cares until it's a problem.
we must have had entirely different careers, same in years and 180 degrees opposite, absolute core (and disqualifying) questions at every interview, no exceptions.
One "enterprise" HR product I had to interact with stored all its data in a single MS SQL Server table, with hundreds of columns. It was basically a spreadsheet based system with an SQL interface. This was more than a decade ago, but still.
