I don't see what you are pissed about. There isn't a single manufacturer that is going to reccomend tht you replace OEM parts for after market parts and if you do they will void your warranty.

If you had a Ruger with an after market trigger on it and you had to sed it back to them for work they will remove your trigger, throw it in the trash and replace it with a factory trigger, charge you for it and after you pay for it send it back.

I'm not sure why you would need to replace the FNH trigger any way.