I think that's off topic nonetheless that allen screw,ambidextrous and extended things,skeletons and beavertails,shock absorbers,Evil Swartz,extended guide rods,night sights,front serrations,safety warnings,stippled front straps,rails,laser beams and shiny metal plating (leave something out?) could conceivably enhance a firearm that needs no enhancement at all.
Nothing created by man is perfect. There is always room for improvement.
Now whether some of these items offer any real advantages is the real question here. Some most certainly don't in my mind (extended guide rods, safety warnings, front serrations), some will benefit some shooters (beavertails, ambi safeties), and some are definite improvements on the original design (better sights).