Highlight outdated cores in Core Downloader?

Just curious if it’s possible to add a feature to highlight outdated/removed cores when using the Online Updater? E.g. Cores that are no longer available for download.

I recently ran two copies of Retroarch at the same time so I could compare what cores I have installed vs what are available to download. Then I manually removed the cores from the Cores folder as there were some cores that, once loaded, could not be removed using core Information.