Have you ever played Mass Effect 2?
You had the option to import previous save files from is prequel Mass Effect 1(or Mass Effect 2 itself). it was good to keep my character for my next gameplay. Wouldn't it be cool if next fallout had the same option? you know, after beating the game, you definitely want to play again + you don't want to completely lose your character.
For example, you will keep your character's name, SPECIAL(including your implants) and you might get to choose some traits or perks you had previously. ofcourse your level should go back to 1.
If you ever played Mass Effect 1,2 you might know how things work and what i'm talking about