I don't think you have the problems with dirty fuel so much these days, it certainly was an issue in the past. A couple of years ago, I cut open the fuel filter that came off my Ford Galaxy after 120,000 miles and even I was surprised how clean it was, barely any staining of the paper. At 30mpg, plenty of petrol had gone through it over the years.
Plastic tanks too, so you don't get the rust dust in the bottom anymore.