Is there a way in UXP to get important folders like we had in JSX? For example, app.path was handy to get PS location to manage presets without the ambiguity of unusual locations (non-boot drives, etc) or changes with different years/OS.
Is this what you are looking for?
No. Those symbols (uxp.storage.domains) cannot resolve to a path string (as far as I know), which you’d need for use in several file access protocols. Additionally, most of uxp.storage.domains is not supported (throws an error if you try to use it in places where domains are clearly supported).