Why aren't component active XOs more popular?

If you use an electronic XO, you are assuming the role of a speaker design engineer, having to equalize drivers to match level and phase. You then have to fine tune the sound, a process known as "voicing".
All that is obviously doable, but not that simple for the home hobbyist IMO.
Another argument against active XO is by the purist camp (not in derogatory sense!) which preaches the least processing to the audio signal as the golden path to "audio nirvana".

I have the Behringer active crossover. It made a world of difference with my maggie 3.5's. However, it was a very time consuming process to dial everything in just right. In the end it was weel worth it.

It is very difficult to get an electronic crossover system to integrate with your speaker system unless the speaker designer designs and manufactures the electronic crossover too! This would be the best match. This could be offered as an upgrade for your speakers to take them to the next level. Any designers listening? I think there is a demand here!