From my experience, I have noticed that the vast majority of companies do NOT take the time to properly reject the candidate.

This was very insightful

By my previous employer they were feedback sessions even for telling you were rejected for position. I had one of that and I felt been very humillated when they told me rejected with presence of hiring managers and recruiter too. I think only an email would be more than enough. So why other companies follow as well this very rude practice?

Candidates who are job searching are busy. Asking them to take out valuable time to receive the news of rejection over a scheduled phone call is very rude. If I was a candidate being rejected, I would prefer to be informed via email or text that I am being rejected, and be offered the option of speaking with the recruiter if I wanted to get feedback related to the reason for rejection. I don't understand why companies assume that candidates searching for jobs have lots of free time to field useless phone calls related to rejection.

Sandwich your negatives and give try to give 3 feedback points

Scheduling a call for rejection is incredibly rude.

What.. where's the meat..