Without love, it cannot be seen

Umineko is not a mystery. It is a book about what it costs to refuse a mystery's terms. Beatrice's game is a trap, and the trap is that accepting any answer — magical or mundane — means giving up on the people the game is ostensibly about.

Battler's arc across the four question arcs is the slow realisation that "without love, it cannot be seen" is not a riddle. It is the whole thesis. The reader who reads purely for the whodunnit leaves the question arcs frustrated. The reader who notices Maria, and sits with her, leaves changed.