FWIW:
I recall a time when ALL flow charts (definitely they were in existence and used LONG before my time) were hand drawn using stencils and straight edges to make them look pretty.
Bottom line, "somebody" had to know what steps were involved in the process before it could be transferred to paper (and then sometimes to a projection slide.)
Back in college in the late 50's and early 60's, I recall we had one guy in my fraternity ho would convert our hideous sketches into beautiful works of art for presentation to the professor in chemistry or physics or even social sciences when we turned in reports. I used him once to show a chemical manufacturing process for a paper I wrote in organic chemistry. My professor wrote on the corner of the chart: "Fred Hoffman does beautiful work!" referring to our fraternity draftsman, whose work he recognized. "You should give him credit for his illustrations in the introduction or afterword of your paper!"
My take on software today is that it is pretty much similar to when I had Fred redraw my sketches into something eye-catching. The idea and steps were mine, I chose to pay Fred for artistry, but there were others who did almost as good a job. None did the thinking for the students who paid them.
I don't know how often you folks reading this thread have to make flow charts, but my suggestion is to consider finding your own "Fred" to use his software to convert YOUR sketch into a pretty flow chart which can incorporate bells & whistles like links and popups into the flowchart using fancy software instead of spending a week or two trying to learn new software for one or two flow charts.
If, on the other hand, your job is to be "Fred," well, then, get the best you can afford!