The ability to pin tables in setup is a fantastic idea. I like to use it all the time, it is better than opening a new browser tab for each table I am working with!
BUT... its usefulness is limited because it does not save the working state. Every time I go to a pinned table, it takes me to the default view. then I have to for example, go to existing columns, then find the one I was working with... etc.
It needs to not change when switching pinned tabs.