Exactly.Yeah, but fiberglass can be reglassed and reshaped.
If a kit is crap a kit is crap no matter what it's made of. If you hit something that's made out of concrete your gonna at the least damage your paint and possible tear or crack a poly kit. Personally I can fix a FG part and paint it in a few minutes can't do that with poly.I've had both the fibergalss and AB plastic kit, and I tell you str8 up fiberglass replicas are crap. It might be "reshaped" to look great but a coupla months down the line, your gonna hit one of the concrete things on the parking, or a dip and the think wll crack off. As for fitting abs , all you need is to heat it up and it will mold and bend much easier than FG. I've had 2 fiberglass kits when I first got into the e46 scene, heck I was planning to start a buisness spraying(painting) fiberglass kits and selling them to people on here when I joined four years ago until competitive abs replica kits started coming in hordes for hong kong/taiwan.
and for handling bumpers, when you screw in a fg kit, the edges where the screws are holding the kit will eventually crack unless you apply glue all the time.