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you just make one rear triangle then glue it on to any frame size.
Ha, aren't they monocoque construction?
Actually @Howard's theory isn't far off. Even with carbon fibre, having one size of rear triangle means all sizes use the same size and shape sheets for the layup, and you don't have to redesign the layup for varying seatstay angles.
Cheaper to produce; you just make one rear triangle then glue it on to any frame size.