Those are all good points, and possible scenarios, on the downside, It feels like you don't think MC and Kindra are mature enogh to face the challenge by themselves (to grow up)
regarding Artemis, i don't think MC and Kindra want to weaponize her, there have been a lot of hints that they want the Androids to fullfill humanitarian tasks.
In my eyes MC and Kindra have to put Cassie in her place, she is their Demon.
The process of grief is something which goes over many years, and it is inevitable that you are remembered to comon activities with the person you lost.
Artemis is a story of overcoming, as I understood it.