#Rant
Whenever you write something, you are (consciously or subconsciously) writing it for a target audience. The way you write to explain something to a pre-teen or to an adult is different, and both are different from how you would write if your target was a toddler etc etc
Scientific papers are no exception. There are of course well written and badly written scientific papers, but all of them have as their target audience other scientists, often only those in a specific subfield.
Expecting specialized scientific papers to be immediately understandable to everyone is completely missing the point of a scientific paper.
#EndOfRant
ps
There is a reason why some people specialize in writing popular science, which is a damn difficult job.