Since the Galaxia Dungeon it is way "easier" to obtain the Glorious Set Pieces but if you really want to have a full set or a set combination you need to do a lot of runs because you can't trade or sell the glorious sets with other players. The only exception for this are the Dragonkin Glorious Sets.
My suggestion would be to remove those restrictions for the human Glorious Sets just like it is done for the Dragonkin ones.