@unboggling - the difference is in how you use them. Your use of symbol prefixes appears to be as a "shortcut" in the search bar.
I however never expected to type just "*" or "-" in the bar, I always prefix them like tags:- in the rare circumstances I need to refer to them. In my case their purpose is purely to reduce the need for another custom column for something I know only a small % of the books I have will need it set on, so a tag (that sorts to the left by being a symbol) works well for this purpose. As I have mentioned above the precedent for this was set by some other features in Calibre like Catalogs, which used a "+" tag to indicate a book you had read along with some other "secret tags" it supported. I don't use catalogs myself but I think nowadays it is likely all customisable anyways.
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