Board Thread:Questions and Answers/@comment-192.153.163.61-20160301141942/@comment-6697950-20180924144621

Heaviness is a subjective matter, especially in a game where stats and levels play a part. Also, Kirito has based his Alicization sword on the Elucidator and the Alicization sword's handle has been stated to be slightly too short for the sword to be a two-handed weapon.

On the other hand, katana are supposed to be two-handed weapons.