Beacon

It doesn’t have to be for kitchen goods

Even then it doesn’t make sense to wall off the space. People have things that they’ll almost never use again but don’t want to throw away. A tucked away space is perfect for that. Just cut a big hole in the sidewall facing the wedge area, now you have storage space you can reach when you take out the drawers.

You have to live in a very oversized house in area where space is extremely cheap to decide to just throw space away. Yes that wedge of corner space under the counter is inconvenient, but it would still be useful for things you only need to get to very occasionally.