Tags need to Sync between machines properly
Currently, when you change tags on thoughts on one machine, those sync to the cloud and propagate to other machines, of course. However, when I go to my other machine and sync, the old tags on that machine are merged with the tags on the cloud. I end up with double tags in some instances.
I use The Brain for tagging tasks for a GTD workflow, and end up with a complete mess as items change over time. It is impossible to use tags to control GTD "elevations" (0k tag, 10k tag, and so on). Tags should not be merged, and should be properly synchronized across machines.
This also goes for Pinned thoughts, as these seem to randomly change and disappear as machines sync.