There's no way to save or load custom workspaces from a file.
I have three computers (two Windows and one Mac) that I work on. I've created a custom workspace and saved it, but there's no apparent way to save it to or load it from a drive. So copying the workspace to the other computers is a PITA that involves doing a Web search to find where InDesign squirrels the relevant file(s) away on each platform, finding it on one computer and copying it to a drive, and then dragging & dropping the file into the proper places on the other computers.
How is this considered a production-ready feature? What is the point?
And while we're on the topic, there's also no way to update an existing workspace even on your local computer. If you change the layout and want to save it, you have to pretend you're creating a new workspace, type the exact same name, and then overwrite it. Again... not production-ready. Not today. Not 20 years ago.