I think there are plenty of people who finish on a coticule, I do pretty much exclusively.

Bear in mind that this forum is not the be all and end all in wet shaving, as it is rather USA centric. Nothing wrong with that per se, but for instance, as far as I know, in Europe the coticule is still relatively popular.

I also often wonder how people on the forum that find coticules lacking use them. For instance, if you are to go through a synthetic progression, say up to 12k and then finish on a coticule, but find the finish lacking in comparison to an exclusively synthetic edge, it's quite likely that something went wrong previous to the coticule; most coticules really do not do all that much on water only, apart from smoothing out an edge.

Best regards,

Pieter