Because the ML designers weren't using their dipstick!!!!
(sorry, that's a US motor oil commercial reference, for those overseas)
But, seriously. Almost everything that, in its human form, required Carpentry and other skills, only requires carpentry (masonry, for the anvils) in their ML Elven versions.
Beds, forges & anvils, etc.
About the only thing right off the top of my head that requires tailoring in ML that did so in its original form was the Elven Spinning Wheel (and for the life of me, I can't figure out why EITHER should require tailoring, unless one uses the excuse that the carpenter needs to know intimately about the spinning process to make them)