1

I think that the tags on this site called and should be made synonyms of each other, and yes, it may be argued that they are actually complete opposites of each other, however asking about what is on-topic is the same more or less as asking what is not off-topic, and visa versa, so is there a place where one would definitely be used over the other?
I don't think so, so I think that they should be made as synonyms of one another.

3

I think the sane solution is the one adopted by Meta Stack Overflow: use a tag, of which and are synonyms.

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