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

PS3 SIGN IN Made EASY Without QR Code In 2022

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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

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

PS3 Device Setup Password issues : r/playstation

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Ask PlayStation on X: Quickly sign in to PS5 consoles by scanning a QR code on the PlayStation App / X