I consider all information about people like LeSage and others who explore rational explanations for phenomena that is poorly understood to be helpful to everyone as examples of the right attitude, regardless if they don't complete the job that we'd like to see completed.
I'm still on vacation, but catching up a little. I must not understand what you mean because I think this does not lead to an attitude of discovering truth about the natural world. Of course, the value of a statement like this depends on the audience. For those uneducated in science, it leads to ignorance. For those focused on discoveries of the natural world , they know that theory must be proven by observation and experimentation. Otherwise, debunked theories like this one of LeSage's lead the average reader nowhere closer to understanding the truth.