I think you're very wrong. I'm the opposite of a Republican, and I think this scandal (the media's and Twitter's behavior, not the emails) is big. Matt Taibbi, a very definitely not-Republican journalist, agrees: https://taibbi.substack.com/p/with-the-hunter-biden-expose-s...
I think the main reason it's not a big controversy elsewhere is due to exactly what you mention - both bubbles absolutely reject anything negative about their side and absolutely accept anything negative about the opposing side. So of course one bubble won't care, or even be aware of what's going on.
There wasn't any evidence of Trump colluding with Russia, though, as explained in Mueller's report. Greenwald has in the past gone so far as to even doubt interference, but he seems to have changed his stance and on JRE the other day he did say they interfered. Also, as you can tell from my post history, I strongly dislike Trump and everything he stands for, to be absolutely clear. I just want to accuse him of the thousands of things he's actually guilty of and not the things he's not guilty of.
If you read Taibbi's article, he's not at all claiming that the emails are damaging to Biden. The headline is "With the Hunter Biden Expose, Suppression is a Bigger Scandal Than The Actual Story".
Like in my posts, he's talking about the media's and Twitter's behavior in censoring the story - not the emails themselves. Everything he says is perfectly consistent with what's said in the Politico article you linked.
Taibbi is one of the most reputable, high-integrity, rational, and truth-seeking journalists working today, in my opinion. Reality often sits between a gray area of poles.
Russiagate has been investigated with insufficient evidence to charge anyone in the Trump campaign. You can easily verify this for yourself. Please stop promoting conspiracy theories.
I think the main reason it's not a big controversy elsewhere is due to exactly what you mention - both bubbles absolutely reject anything negative about their side and absolutely accept anything negative about the opposing side. So of course one bubble won't care, or even be aware of what's going on.