This is the most ambiguous part. In scene jargon, “extra quality” could mean:

For collectors, this tag signals that the encoder prioritized quality over file size.

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To understand the filename’s popularity, we must look at release culture.

Around 2006–2012, 720p became the standard for HD scene releases because:

For Jurassic Park III, which has many fast-moving jungle scenes and dinosaur CGI, 720p at a high bitrate avoids the “blocking” artifacts seen in low-bitrate rips.