Thanks, we appreciate that! We've put a lot more effort and research into optimizing our videos for search and into growing our channel than we have into how to get the absolute best video quality.

We don't always shoot in 4K because our action cam shoots better video in 1080p if we're moving because we get more frames-per-second.

As for HandBrake retaining 4K, I'm not sure exactly how that works or whether or not the original video quality is retained. I thought the video quality is retained and HandBrake's optimizing just makes for a quicker upload.