My view on the utility of those devices :

I lived in Paris for a while. Large appartement have dishwasher, but in single units, it’s uncommon.

I remember looking for solution like that for a renter in a small place without proper plumbing to accommodate a dishwasher.

I also see a market for the so called tiny house folks or full time RVer.

I don’t find that particular product appealing too much, but I would like to see more like that. And I know folks around me that would buy one if it’s was more open and fixable.