No - the point is that true constant quality has (almost) no constraints on local bitrate, so one section of a movie might be twenty times the bitrate of another section. Online streaming services continually estimate the current available bandwidth, then choose from a selection of pre-encoded streams to download. For this to work well, the selection must know the maximum local bitrate of each stream to match the estimation. If this local maximum isn&#x27;t known or constrained, you get buffering because you&#x27;re attempting to download a stream that&#x27;s actually currently twenty times more than the available bandwidth.<p>Whereas your personal video collection probably isn&#x27;t being streamed over any link slower than several hundred MBit&#x2F;s, which is more than enough for anything short of intermediate codec bitrates, plus significant buffering doesn&#x27;t count against any data caps.