I'd think the ease of replacing the OE speakers in their factory locations and not cutting anything is a much more popular way to go about it and few vehicles have a 3-way arrangement.
Those folks who want to go to the next level are probably avid fans of this sport and going active with hand picked drivers for each location is the better way to go. Amplifier channels are less expensive now than well designed and complicated passive 3-way crossovers.
Those folks who want to go to the next level are probably avid fans of this sport and going active with hand picked drivers for each location is the better way to go. Amplifier channels are less expensive now than well designed and complicated passive 3-way crossovers.