It's true that many people get anxious about programming job interviews. Except in rare cases, it isn't really rational. But people get even more anxious about giving public talks, which, as you point out, often isn't rational either.
It's true that people sometimes create artificial time-pressure deadlines. Those people are manipulative schmucks who deserve no quarter. In reality, time to market is a huge competitive advantage, and when a business's site is down it generally loses money every minute; getting it back up allows the business to start making money again. Similar, but worse, when customer systems are broken because your software broke them.
When you're giving a talk at a conference, you're forming part of a community. You have a reputation in that community. That reputation can be good or bad. Having a bad reputation hurts you in myriad ways, even without anyone in the back row making a mark on your permanent record.
You're confusing your limited experience of reality with reality itself, and consequently you come off as dogmatic and defensive, which could limit your learning. I think everyone would benefit from incorporating more aspects of reality into their worldview.
Oh, and if you look like a dogmatic jerk in front of an audience, there's nobody in the back row waiting to make a mark on your permanent record as a result, just so you know.
But, back, now to interviews. I've been in I don't know how many interviews (hundreds, easily, if we count both the ones where I was the interviewer and those where I was the candidate), and I can tell you for a fact that time pressure, performance anxiety, and every single other thing I've mentioned impacts people's interview performance, and does so in such a way that it wouldn't be relevant on the job. I could even cite research to that effect if you like.
For whatever reason, you're now so out of touch that it's absurd. I had a whole point by point refutation of every single thing you wrote here, because for the average individual, it's totally wrong, and it would cause them harm if they tried to incorporate what you wrote into their world view.
Maybe you truly don't feel the same type of anxiety in technical interviewers that most people do. Fine. The fact that you're (a robot, a Zen master, financially secure enough that having a job doesn't matter, a 99th percentile 10x programmer who crushes technical interviews with both hands behind your back and using the whiteboard marker in your teeth, or whatever it is that makes you feel this way makes you not qualified to give advice on the matter to typical, average people.
TL;DR: No. Just no. I can tell you're not going to convince me of anything, and I suspect I can't convince you of anything, either, but my conscience just won't let me let this go unanswered.