I think a part of the more lazy companies is its easier to include if they already did so on a laserdisc or DVD.
Dirty Harry only available in analog form on a time compressed LD not PCM, or available as a retracked in stereo pcm on later releases.
Bullitt on CED in mono and possibly on japan LD not sure if PCM, and retracked stereo on laserdisc dvd and blu ray disc.