I definitely agree Khan Academy should be working to integrate this. I think it's worth pointing out, though, that KA had an integration not that long ago (I don't think it transferred grades but just allowed linking content) and that disappeared when KA decided to completely kill off their API as of July 2020 (link). Without a functioning public API, there isn't much chance of this happening or even someone trying to make a direct integration on their own.
Why they got rid of their public API in the first place I have no idea.
I got sick of waiting and made what I did, getting as close as I could to an integration. But even then, ignoring the fact that they have no API, there isn't a way to import students with sortable names. Both Google Classroom integration and district auto-rostering are unreliable for supplying sortable names for students. It doesn't sound like Khan Academy's integration department is up to much of anything these days. The only change I've seen to Khan Academy in the three years I've been using it is they added the option to include a start date on assignments.
Note: for those of you who don't know what an API is, it's an application programming interface that bascially allows systems to "plug into" each other and share data. Canvas has an absolutely amazing public API. Wish others in the edtech field were more like them in that sense.
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