Playstation 3-PSN QR code

Why did Playstation inplement a QR code when trying to log into a account on PS3? Last time i played "aprox." 3 years ago there was no such thing..i simply signed in had the password typed and remembered but now i lost all of my SAVED passwords for 4 major accounts i had on the PS3. Literally at

Trying to sign in on PS3. Both the QR code I get and the link for security send me here. : r/PS3

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Can anyone help me? I never set up a 2 step verification thing and I can't login on any device. Also what is the authenticator app? : r/playstation

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Why can't I log onto PSN? It shows a QR code and then I enter the code and it says that I can't sign into other people's account. : r/PS3