An UI framework well may have or lack support for hardware acceleration (video encoding/decoding acceleration in particular) or have it incompatible with particular video card models.
Sure, but the Edge engine, although being essentially the same as the Chromium engine behind Electron, can be built with different flags, have different set of accelerations enabled and probably even be integrated with DirectShow (and ActiveX maybe?). I don't know if it is, just speculating.
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I doubt the UI framework has much to say about video chat performance
An UI framework well may have or lack support for hardware acceleration (video encoding/decoding acceleration in particular) or have it incompatible with particular video card models.
AngularJS and React are both web-based; the web browser itself determines the video technology available
Sure, but the Edge engine, although being essentially the same as the Chromium engine behind Electron, can be built with different flags, have different set of accelerations enabled and probably even be integrated with DirectShow (and ActiveX maybe?). I don't know if it is, just speculating.