I'm fairly certain that these patches didn't land until recently, at which point the design decisions were probably already made at Zoom. (I don't know much ab

I'm fairly certain that these patches didn't land until recently, at which point the design decisions were probably already made at Zoom. (I don't know much about Zoom, but that seems like a reasonable assumption.) Additionally, these changes aren't likely to apply to Firefox ESR or IE for a while. In Zoom's case, I highly doubt CORS on its own was a viable solution. Maybe in 2026, a decade after the patch, sure, but in the current climate, it's not reasonable to expect that all users will be using browsers that have adopted these changes in 2019.