If it’s the best soap you’ve ever used, that would negate the claim that soap is soap.

Disagree, the difference is that there is stuff in it that isn’t soap… in the case of that powder soap being superior, it is the added borax that acts as a great detergent, but probably not something you want to use on your skin regularly. And sure, there can be different ratios of water to fats in soap or different fats (lard, tallow, olive oil, beeswax, etc) that do not saponify fully (no soap should be 100% saponified or it would be possible that there is still lye in it that was not used up in the chemical reaction) and give the product different qualities, but the soap in it is still just soap. Or it could be sodium hydroxide lye vs potassium hydroxide lye to make solid vs liquid soap, respectively.

My comments are not really meant to be about hobbies but BS products marketed from massive corporations that are just adding more to our mountain sized landfills.