First, your TV example is not applicable here as that is about patents and not copyright. If Rosing had a patent on his technology, it very well may have expired within 16 years(extremely likely). If that was case, then unequivocally no, Boris should not have gotten credit. Innovation is at least as important as invention. Additionally you don't provide any information on how each person developed the technology. The idea of a television is not eligible for a patent, it is how you do it that matters. Which is why software patents are a bad thing and shouldn't exist since they are almost always a patent on an idea. Ideas without execution/implementation are almost all universally worthless.
Quite often components are not copyrightable. Basic shapes or musical chords cannot be copyrighted. But unique fixed expressions that use them can be. Same with words. Nobody can copyright a word, but you can copyright a poem or book.
I agree with you that copyright is ridiculous in many ways. I'm actually firmly against literally 100% of any expansion on copyright until we get it under control and it actually makes sense. It's a system ripe for abuse by individuals, corporations, and governments to stifle creativity and quite often speech. Copyright as it exists today does more harm than good. Meaning I feel the world would be a better place if it didn't exist at all compared to what we currently have.
That being said, you're criticizing the wrong people here. The fact of the matter is copyright is a liability for the HC team and any platform that allows people to create or upload content. Likely an extremely small chance of it being used against them, but why risk it? The HC servers and the individuals running HC have little to nothing to gain by ignoring it. And however small the risk, it's still a risk.
Finally, and most importantly, more specific rules and guidelines on this likely isn't to happen. Because they don't exist. The HC team can only use their best judgment, erring on the side of covering their asses, because only a court or other government sanctioned body can officially say if something is infringing or not.
Write your politicians, and keep doing it, letting them know how much IP law has been turned into bullshit. And watch extremely suspiciously and closely anytime a big corporation gets involved in a copyright, patent, or trademark squabble, their best interests usually don't align with ours. It's also a good way to find out when a company is out of ideas and innovations. If they start to sue a bunch of other companies over patent infringement that likely means their best days are behind them.