Is there a reason why specific event titles can be stashed whilst others can be stashed?

I would like it all to be stashable so people can choose which toon they wanna open the title in, afterall , the title will still be within the account with the person that played the event.

Since some people might be planning to switch class for a change, they might wanna have some event titles or lb titles that they can stash and use it in specific toons.

I don’t see a reason why this would be a problem. Your thoughts?