Not sure if it means much, but I understand that for many years Ed Brown pistols all used a standard guide rod. He started using a FLGR in his top of the line Custom Classic. When asked why, he reportedly said that some customers thought the highest end 1911s came with FLGRs and asked for them. This led him to offer it on his top end pistol as a standard item. I imagine a lot of 1911s out there come with a FLGR for the same reason -- a fair chunk of the shooting public simply thinks a good 1911 should come with one and manufacturers are willing to oblige.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.