Still true today. To reveal your true thought needs courage. You could get doxxed, beheaded, lose your job or else...
Whereof one cannot speak, thereof one must be singing.
However, that point could lead down Deconstructionist roads where the reader starts injecting nin-existent personal will-o'-wisps into source material.
Suddenly, "Blessed are the cheesemakers" refers to an entire dairy industry, where that may not be supported in the original.
Blind spot in any philosophy essay can be deconstructed, sometimes within the text itself, without external reference (the Derrida way).
And I know nowadays, with the American political discourse trying to sell Derrida like he tried to kill older authors, it's controversial, but his method allows anyone to at least appreciate Bentham even more (I only deconstructed Bentham, so I cannot say for other authors, but to me it makes his philosophy even more revolutionary and visionary).
If you're successful, you can then emit theories on why. Those aren't scientific but a new way of reading the book. If you can't find any 'key' or if the theories you emit makes you read the book the same way, it's a solid theory.
And therein lies the rub. Derrida didn't really write "Speech and Phenomena" as a subliminal manual on the joys of Emacs; I just pulled that line of nonsense from an unlikely place.
Yet we are beset everywhere with abject folly passed of as some Hermetic wisdom. If it sells books, fine. But let us not claim an author said things that are simply not in view. Label "Pulp Fiction" as such.
In a perfect world, i should have read her without knowing her wikipedia page to be able to deconstruct "My Life". I do not have the time to do so (and i already know her wikipedia page, so i would be biased).
In the end if any one view got me kicked out of Philosophy, it was prematurely defending String Theory - just as a possibility. Politics and my being drugged and assaulted by a Professor were larger factors, though.
I thought I read that newton (or another famous scientist or mathematician) published something that was clear enough for non-scientists to read, and the unexpected amount of controversy and hounding he received caused him to withdraw and he didn't write clear papers afterwards.
So - research papers now - I wonder if they are written for peers instead of the general public by design (maybe subconsciously)