This is so true. When I bought my FWB Sport Mk1 new I was dismayed to find it had a plastic trigger, although fortunately it didn't break. I replaced it 25 years later with a lovely wide alloy Jim Maccari one and it transformed the gun. What a stupid decision that was in the 1970s by a company famed for its careful choices!
The company made a similar choice later on the FWB 90 pistol, though it's more of a plastic shoe than the complete trigger and it rectified the mistake quickly, apparently.