Why does every crypto currency use seedphrases?

Is it possible to create a crypto currency that doesn’t use seedphrases? And if so are there already options out there?

Seedphrases are codes that represents the keys right? If that is so isnt there another way people can access their wallets without seedphrases, as seedphrases are easily forgotten and confusing to new people. Also i dont completely understand how seedphrases work or how they are created/stored. Aren’t they just code for the real private keys?

Id love to hear opinions and possible ways something can replace seedphrases to something users create themselves that cant easily be hacked or guessed.