I think it mostly comes down to how much more it would be to make them active and would the normal audiophile be prepared to pay for it.
Active vs passive crossover
I think most of forumers in this plaftorm know what are active/passive crossover (essentially crossover before/after the amplification) and understand the pros and cons of them. Some if not all might even agree the best sound reproduction solution is active crossover with DSP. But, my question is, why the vast majority of companies in this industry still chooses the passive route.