Because these weren't about rejecting candidates in an embarrassing way after a resume had been submitted or a first round interview and laughing at them that they lacked the required skills. This is the complete opposite of that. This is specifically about rejecting final round candidates in a very personal manner. Any professional person who gets to a final round of interviews and is up for the final selection process should want either a phone call or a video call to discuss why they're not getting the opportunity. This allows you to demonstrate your poise and your character for handling disappointing news which comes as a regular course in any job. Also it allows you to interview the hiring manager to get more specific details about what you could have done better because you made it to the end and so it literally comes down to very minor things picking between you and another candidate. You can find out if it's culture fit you can find out if it's some technical expertise. Knowing what those Minor details are that cause you to lose out in a final round allows you to improve your life and your chances at a job in the future.
Handling disappointment with poise and character is a basic life skill that everyone should have learned by their teenage years. It is extremely disappointing that I'm even reading an article like this that people have not been taught the most simple of social skills which is handling disappointment.