I’ve never used a scrub daddy so maybe I’m missing something. But what issues are people having with their regular cheap ass sponges that you need a more expensive one? I always just buy the cheapest sponges on the shelf and they work perfectly fine.

The changing hardness levels depending on the water temp sounds odd to me and I’m not really understanding the purpose.

Edit: For dishes I actually prefer scrub brushes instead of sponges anyway. Sponges give me the heebie jeebies with holding bacteria because of the retained moisture. I primarily use sponges for cleaning sinks, bathtubs, etc.