1. “Self-taught” means someone who doesn’t have any formal education. I don’t know what “boost” you feel your degree gave you, but for most of my fellow students and co-workers I‘ve barely seen much difference other than mountains of student-loan debt and a few years of misery — if you can teach yourself to code, I’m pretty confident that you can teach yourself data structures and algorithms too. Personally, I enjoyed studying Computer Science but it’s clear to me that most of the graduates I’ve encountered didn’t study for passion of the subject and only really benefitted because employers think the piece of paper they walked away with is important.
2. “Still switchers are worse” — do you have any data to back that up? In my experience I’ve found that people who have a variety of interests and backgrounds are generally more creative and passionate, and it can often be an indicator of someone who’s learned from their experience and taken risks to improve their situation (not always, but often). I also find that people who didn’t “grow up in code” tend to have a better appreciation for good UX and fulfilling customer needs.
3. That last phrase makes me think that you didn’t really understand what I was trying to say about live coding experiences. By far my favourite hiring experiences — as both a candidate and as an interviewer — was for AWS, where the purpose of an interview is to get as much meaningful data about a candidate as possible: you’re simply not going to get good data about a candidate’s capabilities unless they’re at ease. I’ve successfully passed enough live coding exercises to appreciate that they’re unpleasantly stressful even when you know what you’re doing, and although I’ve spent many hours entertaining myself on sites like HackerRank* there’s something deeply impersonal and factory-like about asking someone to do a timed exercise during a job application with no opportunity to explain their thought processes or discuss ambiguities in the questions.

* I really love how these operations have gamified coding!