Well we do test them out
. However DA is quite old project which support very heavy customizations and over time is running on a very large number of exotic server configurations. Some of the issues are impossible to reproduce on a freshly installed system. On the other hand we are making a very big changes internally in the code base, which does not really reflect in the change-log.
This is the reason why we prepared rolling auto-update functionality (where DA instances are slowly updated over a period of time and not all at once) and reliable releasing pipeline (where we can easily and reliably release a hot-fix). When we re-package DA release with some minor change we make sure that not yet upgraded DA instances will receive the latest update with the fix and it is extremely easy for us to push an update. In the long term we would like to move towards more frequent and smaller releases.
Thanks everyone for reporting any issues noted so swiftly. Your feedback is really appreciated.