Employees doing the evaluation are usually separated from that communication. They probably wrote down fairly detailed notes each into an interview management

Employees doing the evaluation are usually separated from that communication. They probably wrote down fairly detailed notes each into an interview management system and talked about it in a 30m meeting. But it's up to the recruiting dept to deliver the news / feedback, and because it's a large legal liability trap to actually give feedback and since the recruiters don't have the technical background to understand the feedback in the first place, usually tell candidates not much at all. On top of that, most recruitment departments are bad at most companies because of structural issues in being a recruiter in a first place. To really solve this, you need to remove the legal liability trap. The industry works around it with backchannel communication of the feedback, but that usually means you have to know people on the team interviewing you.