Paper authors are not: they want to look sophisticated, whether their findings are sophisticated or not.
Paper reviewers are not: they want to preserve the usual style, at least for consistency, and also because they are authors of other papers, too.
Readers who are specialists in the field? Maybe, but they are used to the jargon and easily see through it.
Readers outside the field? Maybe, but nobody has an incentive to care about them, they are not reviewers, not potential co-authors (unless you plan a rare cross-disciplinary study), and if they approve grants, it may be better to impress them with the jargon and look important.
The rare curious non-scientist reader? These are a rounding error.
[1] https://philarchive.org/archive/ALEATO-6 "A type of simulation which some experimental evidence suggests we don't live in"
We had a problem at UC Berkeley where a very smart CS guy wanted to publish a paper but since he didn't have an official affiliation, major journals wouldn't publish his papers (they literally wouldn't publish a paper by a person whose correspondence address was their home address).
So we gave him a title at Berkeley and the paper was published.
His work is some of the best around, but the academic community wouldn't pay attention until he ran some benchmarks and had them disseminated by prominent academics.
So our best guess at changing the status quo is the reviewers?
If the reviewers would push for readability, this would force authors to adapt, right?
Now, how do we convince people to change expectations and habits?
Then I got reviews saying I have to cite x, caveat y, relate to z and discuss special cases a,b,c... By the time you've done that there is no way it's going to read nicely any more.
But to play devil's advocate, the reviewers are right. The permanent scientific record does need all the nitpicking details. Papers are not supposed to read like news articles. Now I try to get a good abstract, intro and confusion and accept that the rest will be nit picking.
The most familiar example is nutritional science, and the whole fat vs carbs debate. There are a lot of easy examples in medical science and economics as well. The scary thing is the more scientific articles you read the more you see this pattern everywhere. Scientists have greatly oversold the degree of their knowledge in most fields.
My impression is that the people doing the overselling were very much not the scientists in almost all cases.
Structurally it's similar to clickbait. I heard that such an incentive structure did bad things to journalism.
I find it far more likely that the mistrust comes from those articles combined with the fake experts that appear on TV. This is less of an issue in Europe, but it does happen here as well.