If more people reproduced the dmcrypt issue and commented in the bugzilla issue it'd put more pressure on upstream to revert the known offending commit.

For some reason they seem to be prioritizing the supposedly improved dmcrypt performance over fairness under load, even though it makes our modern machines behave like computers from the 90s; unable to play MP3s and access the disk without audio underruns.

I assume it's because they're not hearing enough complaints.