I don' think anyone would disagree that the 1 mil. conical stylus, while optimal for early mono records, wasn't ideal for later stereo records.I agree that the 1 mil conical is not a goof choice for micro-groove but I also do not believe it is the best choice for early mono recordings. I prefer the sound of the micro-ridge compared to anything else for all of the mono I have played with. The simple fact is that back in the day the 1 mil conical wasn't the "best option" it was the "only option". Just because more advanced profiles didn't exist in the 50's doesn't mean they engineers and enthusiasts of the day wouldn't have used them for playback if given the chance.
here is a "to scale" image comparing a micro-ridge to a 0.7 mil conical.