If there is something I'm missing dearly is to visualize the connecting dots.. in systems it's very common to categorize, assign users, assign tags, assign products. et cetera. The use cases are enormous. And in the current state you are going to end up with a lot of details. Which is good if there is extra information to find. A bit too much if it's just to 'connect' the subjects.
See below an example that would benefit the Universal GUI a lot.
https://muhimasri.com/blogs/mui-multiselect/#introduction
