In the typical "experimental report" sort of paper, the focus is typically narrowed to a knifes edge around the hypothesis, the methods, the results, and analysis. Yes, there is the "Introduction" and a "Discussion", but increasingly I saw "Introductions" become a venue to do citation bartering (I'll cite your paper in the intro to my next paper if you cite that paper in the intro to your next paper) and "Discussion" turn into a place to float your next grant proposal before formal scoring.
Review papers, on the other hand, were more open to speculation. I remember reading a number that were framed as "here's what has been reported, here's what that likely means...and here's where I think the field could push forward in meaningful ways". Since the veracity of a review is generally judged on how well it covers and summarizes what's already been reported, and since no one is getting their next grant from a review, there's more space for the author to bring in their own thoughts and opinions.
I agree that LLMs have largely removed the need for review papers as a reference for the current state of a field...but I'll miss the forward-looking speculation.
Science is staring down the barrel of a looming crisis that looks like an echo chamber of epic proportions, and the only way out is to figure out how to motivate reporting negative results and sharing speculative outsider thinking.
On one hand I'm the person who implemented the endorsement system for arXiv. I also got a PhD in physics did a postdoc in physics then left the field. I can't say that I was mistreated, but I saw one of the stars of the field today crying every night when he was a postdoc because he was so dedicated to his work and the job market was so brutal -- so I can say it really hurts when I see something that I think belittles that.
On the other hand I am very much an interested outsider when it comes to biosignals, space ISRU, climate change, synthetic biology and all sorts of things. With my startup and hackathon experience it is routine for me to go look at a lot of literature in a new field and cook it down and realize things are a lot simpler than they look and build a demo that knocks the socks off the postdocs because... that's what I do.
But Riemann Hypothesis, Collatz, dropping names of anyone who wrote a popular book, I don't do that. What drives me nuts about crackpots is that they are all interested in the same things whereas real scientists are interested in something different. [1] It was a big part of our thinking about arXiv -- crackpot submissions were a tiny fraction of submission to arXiv but they would have been half the submissions to certain fields like quantum gravity.
I've sat around campfires where hippies were passing a spliff around and talking about that kind of stuff and was really amused recently when we found out that Epstein did the thing with professors who would have known better -- I mean, I will use my seduction toolbox to get people like that to say more than they should but not to have the same conversation I could have at a music festival.
[1] e.g. I think Tolstoy got it backwards!