Probably mostly because they have a Country Music affiliation. Country licks blah blah blah... Another reason , for routed systems you can't route a contoured body so a system like a Glaser would be required. Not Cheap. To have a system installed is not an inexpensive proposition. Fender put those PG systems in USA Tele's in 97 for $799. I bought one ! There are other guitars that have pull systems installed, like this one . But it can get cost prohibitive. This is a Gibson Music City jr, made for 2 years around 2012 or so. It has a Glaser strap pull system, minimal routing under the pick-guard. The guitar sold new for around $1300. 500 or so made . Today they are hard to find even at $1300 ! Very different from a Tele, a very flat 12 " radius with P90's. It doesn't sting you with the high end like a Tele does. Nice player though, lots of punch. even the 12" radius gets comfortable after a short period.