API endpoints for current user profile (e.g. lists)
Would allow users to import/export their lists from/to other services like Playnite and RAWG.
I'll probably just build my own system for storing the same data in the absence of the API allowing me to auth users and store it on their accounts. Seems like something you would want to add so other people aren't competing with your feature set.
I'm building a ReactJS app and I'd love this feature, as I would like to build a "my collection" page that allows me to add to a personal list on the account, and also add some basic data like percentage of completion for displaying as a simple pie chart or progress bar.