Your metal woods actually have a proprietary hosel/ferrule combination.

I hate working on those heads, as you basically pull the 'hosel' off (so you need a spacer to push on the actual head). Most heads you push on the hosel (including the new Titleist 905's with their aluminum hosel).

I've not looked into the history of ferrules, but I can't think of a reason why no-one else does it (save patents).