Vader's mask was brought to the Forest Moon, but his saber got cut off with his hand in the throne room. maybe Luke was like "oh crap this place is blowing up, better grab dad's symbol of darkness while dragging this heavy ass robot suit to the shuttle", but if he did that and Kylo found it, why not just use that one instead of creating a janky copy?
and I don't worry about how much more dangerous a lightsaber is with the hilt. the thing by default is already deadly to any non-Force user that would try to wield one in combat, so we just have to assume a Sith would already have the requisite dexterity to deal with a hilt. it's also a weightless blade so it doesn't matter if it's as big as a broadsword. Kylo could configure it to be the length of a pole vault and still swing it around as fast and elegantly as he wants.
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