I will say it again. Everything else is just a copy.
So FN copied Glock's replaceable frame rails? That's right Glocks don't have replaceable frame rails.
Walther, FN, S&W, and SIG amongst others copied Glock's changeable backstraps or grips? No, once again Glock doesn't have changeable backstrap or grip options.
Springfield Armory copied Glock's grip safety too right? Ohh wait, Glocks don't have a grip safety. And Taurus, HK, and Ruger copied Glock's manual frame or slide mounted safeties too? Nope, Glocks don't have any external safety.
Walther and S&W copied Glock by allowing for takedown of a striker fired pistol without pulling the trigger too? Nope, you've still got to pull the trigger to take down a Glock.
FN, HK, Walther, S&W, Ruger, and others copied Glock by offering ambi or reconfigurable mag catches too right? Nope
the G21SF copies these other designs by offering an ambi mag catch.
Ruger, SIG, FN, and HK copied Glock's hammer & firing pin design right? No, Glocks have a striker.
SIG's DAK, HK's LEM, Walther's AS, and Taurus' SA/DA are copies of Glock with their restrike capability right? No, Glocks don't have restrike capability.
Kahr copied Glock by offering a singlestack poly frame pistol right? No the
Glock 36 is a copy of the Kahr pistols.
Springfield copied Glock by offering a .45 ACP chambered pistol that's barely larger than their 9mm/40 S&W/357 SIG chambered guns as well right? Actually
the G21SF is where GLOCK COPIED SPRINGFIELD - poorly I might add as even the SF is huge - after they saw that their 45 GAP "solution" was a commercial whimper rather than a bang.
I could go on, but it's late. Now, please explain to me how these unique features - many of which Glock's latest pistol the G21SF copy - equate to "everything else" being just a copy as you say. The facts disprove your ignorant assertation.