I've speculated this in the past. It seems like when MR stopped producing items, the prop replica line went to eFx and the FX lightsaber line went to Hasbro. I further speculate that the categories in the contractual language keeps Hasbro from selling removable blades lightsabers as then the item can become a static prop and infringe on eFx's license (or at least a licensee they do not have).
If you look at the Black Series like the lightsabers and helmets, they are geared for adult collectors but they also have features (electronic sounds, interaction) built in that makes them have playability and as such, a toy, So it would seem that Hasbro has to make their items in the toy category.
Just my guess.