I'm going to guess there's a couple of reasons for the emphasis on soaps in puck form rather than cream soaps. The most common entry level for soapmaking is cold or hot process soapmaking. People learn from online sources, or from a book, or through classes offered by an experienced soapmaker in their community. But liquid soaps, cream soaps and glycerin soaps (the kind made from scratch, not pre-made mp bases) follow different procedures; in my mind they are specialty products that you branch into, not start out with. It doesn't mean that they are harder to make, but my impression is that it's more common to start with bar soap.
Cream soap is a particular type of hot process soap that uses both sodium and potassium hydroxide, extra glycerin and stearic acid, but it needs a very long resting phase that can last months before it's ready to use, and that's a long time to wait to see if you've got a winner or not. It also needs a preservative, which not everyone wants in their soap. As for special equipment, you need a crockpot to cook it in, and phenolphthalein to test to see it it's done, and the usual oils and lyes needed to make the soap.
One advantage I can think of in offering a cream soap option (for the soapmaker) is that once you have a good recipe you can make a lot of it and custom scent small amounts as needed. But time spent experimenting on a product that you don't know if it will sell, is time taken away from running your business or making products that are in demand immediately.