Would it be such a big deal for the obsidian team to provide a command to update the outdated tag, cssclass, and alias keys in the metadata?
I could imagine that this breaks things for a lot of obsidian users. I must confess that although I generally read release notes, it slipped under my radar that these metadata keys were marked as deprecated in release 1.4, and I don’t remember any warning message from obsidian when using these deprecated keys. Further, it seems like a simple renaming of the key name is not enough, since the change requires the tags, cssclasses, and aliases to be a list. If you have just a single tag, cssclass, or alias, chances are that this is just a string and not a list. Although I would probably be able to write a script to do the renaming and conversion from string to list, I doubt that the average obsidian user is able to do this.