“the water is starting to darken and it is looking much more like a soup should”
“I hope that this thickens it up just a little bit more and so it will start having the texture of a real stew”
“Adding a few more to the mix.”
“Hoping that sitting in the stew for a long time will allow it to break down and provide more flavor.”
“Added to address the blandness of the stock.”
“Topped off because the stew lost a lot of water.”
“the water is starting to darken and it is looking much more like a soup should”
Not explicitly tasted, but the broth is darkening.
The creator is focused on the visual and textural evolution of the stew, adding potatoes specifically to increase thickness.