It's not that "Ciri is less important than dying", but that in medieval fantasy setting it is easier to justify doing side activities. Geral is a vagabond, has literally nothing besides a horse, armor and weapon. And yes, the game doesn't have any survival mechanics, like managing sleeping, etc., but when roleplaying as Geralt, doing a monster contract or even playing Gwen to gather some money to "pay" for a room or get food, is realistic. Hell, in books Geralt is also looking for Ciri and he travels a lot, does a lot of side activities and it is believable because the world is huge and we are talking about a guy walking or riding on horseback.
On the other hand, in CP77 V has a car, a flat, a public transport in NC, etc., so the idea of doing side quests while literally dying is really jarring.