The "save 50% of bitrate" is just a marketing trick. To be honest, it basically means that you can get watchable video with 50% less bits. When there's not enough bits to spend, x264 starts to create blocking and x265 blurs. Blurred video is easier to watch than a really blocky one.
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And if the band you're in starts playing different tunes
I'll see you on the dark side of the Moon...
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