It was introduced when Spellcrafting and Alchemy was added. It's possible that some people may already have had all characters who could do one or the other having a tradeskill already (if they wanted to build siege, or repair doors, for example). So they added a way to remove it, so people could do the new trades.
They may want to be able to craft on a particular character, though. For example (and I'll not be doing this!), Darzil is currently an armourcrafter, and a Guild officer. Maybe I'd want an alchemist, and for it to be Darzil, cos I'd prefer to be on as Guild officer, rather than unknown alt. So, I'd then want to respec.
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