It's up to the individual who owns the Glock to do whatever they like with it. It's immature and rude to criticize those for trying to be helpful by advising someone regarding the safe use of their weapon. Looking for assistance, or just trying to help is why most people go onto a gun forum. No one knows everything and you're never too old to learn something new. If ignoring someone with many years of training in LE is decided then so be it.
Most accidental Glock discharges occur while holstering the weapon due to either a poor quality holster where the rim of the holster catches on to the trigger as it's being pushed down, or a trigger that's been lightened, or both. Statistics will show the vast majority of wounds are to the groin, or leg.
There are too many after market gimmicks being sold out there making lots of money for some. Not everything sold is bad, or dangerous, but I'd just suggest before anyone tampers with their trigger to think long and hard about what they're doing. Safety has always been my first concern where guns are concerned, especially with children being around. There are those who will say how great things worked out for them after fooling with the trigger. Maybe for some that's true, but maybe some of those telling you this if ever met in person would prove themselves to be morons and whatever their opinion is should be disregarded.
I carry my G27 most of the time and am confident with what I can do with it using the 5.5 lb. factory trigger. But what serves me fine might not be the case for others. Maybe a different weapon would be the better choice for some.