Imagine you enter a room of scientists
Please don't make me. It happens to often and enters my sleeping mind as nightmares.
If all of those scientists are of the same field, then perhaps the explanation and the discussion can reach the full heights of intellectual discussion. But if the scientists are a mixed bag of backgrounds, the discussion will either sideline some completely (ie. non-populist/elitist) or be dumbed-down to the point of more general comprehension.
You hit upon an extremely deep point here, actually. Time was your average physicist spoke Latin and the modern languages of scholarship (at that time, German, French, and Italian mostly), was more familiar with the philosophy and the history of philosophy than mathematics (hence the formulation of quantum mechanics known as "matrix mechanics" was developed by one who did not known what matrices were), and we had sociologists, not social neuroscientists, social psychologists, etc. Modern science is
extremely interdisciplinary, which is great on the one hand, but it means that for any given field, specialists are actually scant because to be a real specialist requires specialization in something as specific as the construction of satellite temperature records from MSU signals (which is the only reason Dr. John Christy has continually been asked to contribute to the IPCC reports). If one attends a seminar or conference for specialists, increasingly these have become people who are ostensibly in the same field having to tell their ostensible colleagues the basics of their work.
So, sure, I would agree that a populist movement will not have the most intellectually rigorous arguments possible.
The problem (or part of it) is, as I see it, partly the increasing lack amongst scientists of more general philosophical knowledge and the familiarity with the philosophy & history of science. Hence the reduction by those like Dawkins of theology and philosophy to his knowledge of the sciences and an inability to engage in the type of discourse scientists & academics such as Russell, Whitehead, Freud, Lewis, etc., were capable of.
Basically, the increasing specialization has made it so much harder for any academics to be polymaths of the type that virtually all academics were less than a century ago.
It's not like Russell's writing aren't readily accessible, for example.
But much of them were meant to be and were (not his and Whitehead's
PM, but his history of western philosophy and "why I am not a Christian" and so many other works now considered largely inaccessible were intended to be accessible).