One more BI-WIRE question

I've read as many of the expert opinions on the bi-wire subject as possible and have done my own research and listening test with different speakers I've owned.The electrical theory as to the advantages make sense to me.The question I pose is this:I just bought a pair of monitors from a well known Italian maker that are equiped for bi-wiring.The dealer and US distributor both claim that these speakers would not sound better bi-wired and indeed were not designed to.The only reason for the bi-wire provision was to satisfy the demand of the European market.Does anyone know if one type of crossover design is considered optimum for bi-wiring.Other than marketing I'm trying to figure the makers logic here.....Thanks