I'm always trying to write in general terms, so yes, some of this isn't applicable to Pendragon's guitar, but it did get a bit confusing when he said the strings were hitting the fretboard, so either he'd have to raise the bridge up a bit or reduce the shim height.
You and I may look after out guitars, but there is a large percentage of people who don't. Some people have hands that sweat a lot, and a percentage of those have very acidic sweat, so it's often not long before even a brand new bridge starts to corrode and go rusty. A roller bridge for that type of person may not roll for very long if they aren't constantly cleaning it. For others with dry hands, and who give their guitars a going-over with a duster after use, may well get many many years of use from one.
"As for the problems with roller bridges I guess it comes down to if you don't like something you just make up stuff to justify your bias". Do not ever accuse me of making things up again. I'm just relating my and other peoples experiences and what I believe to be technical facts. I've got no idea what bits you thought I made up, but I only ever want to know the truth about how these things work. Try looking at other people's points of view, rather than dismissing things out of hand.