As for active systems apparently lacking weight, I wonder if that's something to do with the mind set and preferences of those who design active systems, or maybe a lack of distortion from the bass?
Why would passive crossovers add more distortion? The only potential source of distortion in a crossover is choke saturation but with air-cored chokes that is also eliminated. What chokes unavoidably cause is a drop in effective damping which, all things kept equal, could mean a slight bump in the bass frequency response.