Well, that's not technically correct - there is the Mer Bugzilla. This unfortunately is correct. While things seem to be improving (more link to the Mer bugzilla tend to show up in recent detailed release notes and bugs generally seem to be less ignored than before), it is still a mess. For example there is just a single component for all Qt5 related issues (!) and many Mer/Nemo components are missing outright, so people tend to fill bugs on the .Other component... And of course this is just for the Mer/Nemo components, so it can't be used for report the actual issues people are having with Sailfish OS, at least until the issues is pinpointed to a Mer/Nemo component.