Both something like starred or -starred in order only search over starred items or exclude starred items explicity would be very helpful for me as well.
Use Case: When I am trying to organize a topic, my first step is to star notes that might be relevant for the topic. I often do this by a variety of consecutive searches. Obviously, in the later searches I do not want to have notes in the results that I have already starred. Later on, when, after having enough notes, I use search to start orienting myself within the selection. Here, I only want to engage with the starred notes.
In addition to the argument that it is redundant functionality to tag the selection of notes with #star, it also very tedious to manually tag - let’s say - 20-50 notes since we do not have bulk tagging of many notes at the same time.