That´s true, and I think some software get this function later.
The first DVD-drives also weren´t that fast, so the old software don´t need to brake the drives.
Anyone remember CD-Bremse or Nero Drive Speed? These software was made to speed down PC-drives for a quiet operation while playing Audio-CDs or Video-DVDs.
But it worked not with all drives.
I remember my good old 48x Cyberdrive CD-ROM. Fast with all types of CD, but listen to Audio wasn´t so nice because it stayed on very high rpm and the LED shows it only reads a second and idled some seconds