Here is the initial changelog message as to why this was disabled:
+ 0090-disable-flat-volumes.patch: Many people seem uncomfortable
with PA's new default volume adjustment routine, so disable it
in favour of the existing behaviour known in previous Ubuntu
releases. The downside is that the user again has many knobs to
fiddle; the upside is that applications can no longer drop the
volume floor. This addresses LP: #403859, #433209.
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Disables flat volumes
https://bugs.launchpad.net/bugs/507922
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