Many times crossover parts and values are selected to get the sound the designers wanted. Just putting in costly parts in many cases will make the speaker sound worse. Different parts have different insertion values you may end up altering the output of one driver over the other or cause the amp to see different OHM loads or have phase issues toss in the fact that most don't even know how to solder properly and it's an overall dumb idea to do. But the audiophile will why I don't consider myself an audiophile I have grown out of it.
Modifying Crossovers
I just read a post about changing resistors and caps in the new Borresen X3 speakers. I am curious why there is interest in changing the components in a brand new speaker. I also am curious if it would make them better than why didn’t the designers put a better component in the first place. Just a thought and scratching my head. Have a great day.