it seems to me that slickness is directly related to hardness such that in general hard soaps are slicker than soft soaps, croaps, and creams. Not talking quality or cushion or skin care or anything else. Anyone else feel this way?
Slickness & hardness are totally unrelated.
Sickness & hardness are totally unrelated.
If Williams isn’t that hard, what is a very hard soap?
Ok, so in my experience I'm not a fan of the harder triple milled soaps. I don't dislike them but I find that there are plenty of artisan soap makers making what I'd consider to be far superior products.
That being said I suspect that you're having a better experience with hard soaps solely because you are picking up less soap from them. They load quite a bit more slowly being a harder soap than a softer soap would. So you're getting a bit more water and a bit less soap when you use the harder soaps. More water can equate to a soap feeling more slick.
If you switch to a softer artisan soap, like Grooming Dept for example, and use a bit more water than you've been using in the past you might find that it will far surpass the performance of the harder soaps.
Most (but not all) of my favorites for slickness are ‘tallow’ soaps, including some of the Italian croaps. YMMV for sure!