https://www.dualshockers.com/cyberpunk-2077-dev-explains-lack-of-new-game-plus/
Cyberpunk 2077's lead quest designer tells DualShockers exactly why there's no NG+.
The developer then detailed how the game's prologue is about "becoming a legend," while the remainder of the game is about dealing with terminal illness. "It’s incredibly difficult to figure out a way where New Game Plus could be done in a way that doesn’t completely break the way the game is constructed," Sasko told DualShockers.
"By design, it would require major changes to the construction of the game to really do it well."
That Cyberpunk allows you to resume from the last open world save before committing to the ending(s) is good enough for me. Often I abandon New Game+ saves but I’ve continued playing my play through of Cyberpunk because I can jump into the different endings at any time.