Nearly all new guns sold now have their mechanisms designed to block the firing pin until and unless the trigger is pressed. Revolvers and semiautos alike. Replica guns sold may or may not have such modern features, though.
If such a feature exists, then the heavier trigger pull becomes irrelevant; the gun will not fire when dropped regards if the trigger pull is one pound or 15 pounds.
Many, but far from all, semiautos have loaded-chamber indicators, either a pop-up indicator or a viewing port that lets you see a bit of the cartridge in the chamber (if one is present).
Magazine-disconnect safeties... well, there are opposing opinions on the pluses and minuses of them.
Pistol-grip safeties, done properly seem to work just fine. Done improperly they can make shooting unreliable.
The fundamental problem, though, is that genuine accidents are pretty uncommon, so any improvements will likely not be statistically noticeable.
When I get my home-defense pistol, it will likely have several of those features. And be in a safe.
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