Why not put crossover networks in accessible compartments?

It is also extra expense and complexity in a build, which raises retail prices, in order to satisfy maybe less than 0.01% of the potential buying public. That one in 1000 or less...who might tear the speaker apart and modify it.

There are other reasons to compartmentalize the crossover, and that is separation from the physical interactions of the drivers energy input into the box. To get the crossover isolated in all ways.

We use outboard passive crossovers, in the speakers we have made, over the years. Which makes it easier to go to active crossovers.