Well not being with the sharpening back then I can only go by my particular skill level with what was available back then as opposed to what is available now. It seems to me that modern synthetic hones and other media may offer a slight advantage in sharpening razors.

OTOH, the coticules and Eschers were great hones then and now. I am reluctant to open myself up to getting flamed but I will say IMO that while the coticule won't get a razor as scary sharp as a 16k Shapton or a 12k Naniwa it will get a razor sharp enough and more importantly will have a smoother feel than the scary sharp edges.

If I am not mistaken a barber would rather have a more comfortable and maybe longer lasting edge than what they would have with the scary sharp hones. Since I don't shave anyone but me I may be all wet on that assumption.