The mechanical issues Glock aficionados will answer quickly (probably many advising Ghost) but that will disqualify you from Glock Sport Shooting Events if that matters. Might also affect your IDPA category but haven't kept up with the rules on that.
The legal question over whether lightening the trigger is a good idea is much more complicated. It COULD be an issue as you apparently are altering a factory part and thus if you shoot someone--they could blame your workmanship on the trigger and suggest negligence. You might not be held criminally responsible depending on the various factors but you could be sued in civil court where the burden of proof for the plaintiff is much lower (preponderance of evidence). It may invalidate homeowners coverage depending on your state and company if the insurance company claims that you were intentionally negligent and so forth. The key word is might, maybe, etc. There is not a definitive answer for everyone. You might want to ask on the legal forum or your local attorney about that.
The practical question of the tradeoffs are more for trainers and self defense gurus--imho self defense guns and competition guns are two separate animals. One is a tool to protect you from the direst possible harm. The other is to rack up points and win a competition. Self protection demands a firearm that works in all conditions and less subject to accidental discharge--thus giving up long distance accuracy for safety and reliability is a tradeoff I am willing to make. Competition often means making that 25 yd shot and fractions of an inch count. You may only fire one profile and type load that the gun likes as well as lightening springs etc. to wring out every bit of accuracy while trading off absolute reliability and an occasional double shot downrange. This is a strategies and tactics question.
