I completely empathize with this sentiment and understand where you're coming from. However, I've been writing tutorials and documentation for awhile now, and while editing my videos I realized that I would often say "see, simple" after explaining a topic (which is equivalent to just simply in my opinion). I realized that 99% of the time I said that, it was filler and unnecessary, almost like a nervous tick.
Aside from that, of course it's simple for me! I'm the one writing the documentation or creating the tutorial. I've tried to simplify the material into digestible steps. However, this also means I know the subject at hand inside and out. My target audience doesn't necessarily know it as well as me.
So, instead of saying, "see simple" in my tutorials, I began asking myself, "is this concept truly simple for my target audience?" If it isn't simple, then that points out an area I need to clarify and simplify further. I only consider the video/documentation done when I can truly say to myself that the technical content is concise and simple enough for my target audience. This leads to better technical writing (no unnecessary filler), and it leads to a hopefully thoroughly thought out description of the material at hand.
So I don't believe people are being babies or shamed into quitting their careers over a misplaced "simply". Rather, I think they're subconsciously understanding that the writer of the documentation wasn't ruthlessly cutting down the material. I think "just simply" often points to lazy writing, and people pick up on that. Good documentation is ruthlessly concise, truly simple (as in its reduced to the smallest piece of information possible), and it conveys the necessary information quickly.