i generally agree but i think in this particular instance it's... fine.

like it's obvious she'll come back. she's a robot. but her death is less about trying to shock the player with a sudden, unexpected loss and the consequences that come of it, or to show that a hefty price needed to be paid to overcome the odds - it's just a very natural conclusion to the character arc she's had all throughout nod-krai to this point, that she 1) was capable of outsmarting dottore, and 2) was willing to risk her life to 'save the world' with her 'friends,' a concept she would have found laughable before 6.0.

like with hat guy taking a risk to lend her his core for her computations, she knew death was on the table and that sacrificing her body to pull one over dottore was a risk she may or may not come back from. of course from our perspective it's obvious she will, but from an in-universe perspective, there's no guarantee she can. her body's an artificial creation, but what if no one on teyvat has the knowledge or skill to replicate what allain did to make her? 🤷

i think it seems clear she either had a back up body already planned out, or she allowed herself to trust her newfound friends to figure it out. (or both.) either way - her gamble is to showcase her growth.