Ok? "You only have to wait a few months for this crash to be resolved." still doesn't resolve people's issues.
“Fix playing of custom alarm sounds” doesn't sound like a severe issue to you, but it was also something that if someone needed, they were forced to wait a few months.
Debian would rather have broken custom alarm sounds for several months, even if it was fixed earlier. Fixing a bug to me lands closer to a security issue than "shipping bleeding edge feature sets".
It ultimately means if something you need is broken for a non-security reason, it is not being fixed until the next point release. There is a fixed unit of time in which you know your problem will not be resolved.
Packages are individually updated for security fixes. Individual packages are NOT updated for bugfixes.