What saddens me the most is that there are a lot of "small" issues that are found now (and by small I don't mean that they are not critical or important, just that they are a small feature/% of the whole), and we forget that Apple teams managed to upgrade the whole filesystem to APFS on this version of macOS, which is a huge feat. We haven't heard that many problems with the filesystem itself or with the upgrade, which is truly impressive at that scale and complexity.