There are genuine differences in browsers that need to be handled correctly and aren't easily observable or runtime-detectable. Multimedia (needed for camera/mi

There are genuine differences in browsers that need to be handled correctly and aren't easily observable or runtime-detectable. Multimedia (needed for camera/mic handling) and WebRTC still remain a giant landmine that requires UA testing 10 years later. Web advocates can scream from the rooftops as much as they want that nobody should do UA testing, and then have basically no response when we encounter genuine browser bugs that can't be worked around.