Price is at a premium per foot. Any extra step in the manufacturing process is big money when they are placing 5000 ft of 1200 pair cable. I've only seen split pairs on drops and once out of a x connect box. Both cases are guys trying to avoid fixing a resistance fault. It's really never been a problem splicing for me. It's always the repair guys.

Also I think we got two cos around here that's got a couple hundred feet of split pairs because everything has bad lb and minor noise despite having good resistance and voltage.