Everything that buyers demand prevents gun companies from doing much visually. Every pistol now needs an accessory rail to be competitive, so the fronts of the frame all look the same. Military and police forces demanded striker-fired pistols, average buyers followed them, so the backs of all slides are flat and (almost) every trigger has a dingus. Then red dot sights came in, and it's easier to mount them when the top of the slide is flat, so that's exactly what happened to every model.

Then other shit got common like forward slide serrations that nobody asked for, and we're stuck with the current hell where the only way for manufacturers to visually distinguish their gun is patterns in the slide serrations and grip texturing, but it looks like aluminum frames are making a bit of a comeback. I want to go back to when caliber and trigger/safety options from the factory were important offerings.