For Xojo I see the will to fix bugs. However, there are just too many of them for way not enough developers.
Bug checking is even worse for us.
Often a bug needs testing on all three platforms and for 32 and 64bit builds.
It gets a little more complex if the bug is raised against a specific OS version.
Typically the bug is checked against that OS version (if possible) AND the current release of that OS.
Then mix in browsers for Web application testing and things get busy real fast!
Apple QA engineers have an easy life!