Strange, but I don't recall anyone ever complaining about the lack of a manual safety on a revolver..... The safety on a Glock is the same as the one found on a revolver; KEEP YOUR FINGER OFF THE TRIGGER unless you're shooting something.
Um, no.....
YOU HAVE TO PUT YOUR FINGER ON THE TRIGGER AND PULL IT.... before you can take down a Glock to clean it.
Additionally, that Glock comes with a 5.5lb short travel trigger quite unlike the 8-12lb long travel trigger of a DA revolver. Neither does the process of pulling the trigger on a Glock give other cues the gun is about to go off as in a rotating cylinder and rising external hammer.
Cant readily tell a Glock is loaded either just by looking, unless one takes the time to peer through that little slot in the chamber, in good light.
Birdwatcher