The plan is to allow using the -tag syntax in Test Tags like

*** Settings ***
Test Tags        -example

for removing tags set earlier, for example, in suite initialization files or by using the --set-tag option. That functionality is planned for RF 8.0 (#5250).

This issue covers deprecating using tags like -example as literal tag names. Such usage should cause a deprecation warning to be emitted with a note that escaping like \-example is possible.