After writing this post, I’ve switched from peekAll to findAll, which will then keep the model in the component up to date.
Or dear. These fridays …
###Edit:
Due to the fact, that store.findAll() seems to keep the model of the controller/component up to date, while store.peekAll() and store.query() will do that not, how can we ensure, that store.query() will keep the component up to date? Is this possible? Otherwise it seems, that I’m always willed to perform a store.findAll() on smaller components, that manipulate an model array.