I was so happy to see this request already exist!
I think this feature would be so crucial helping those of us who work on a meandering path quickly and effectively get started on complex tasks. I often like knowing I have the materials available and accessible to me and with this I could quickly create notes that get a certain system in place without having to fully populate it first in order for it to make sense later. I could start a couple of them and it would later be clear to me where I was headed despite whether the query search returned the results I clearly was looking for yet.
For example, if you know that there is a certain concept in your vault that is applied within various contexts and has yet to be identified or organized, you could create a note with one of these truly transcluded queries searching for a tag of that concept even though those notes and/or MOCs and/or compilations of embedded examples have yet to be developed. To get going you could create a few different flavored compilations of embedded headings from other notes where a specific flavor of that concept occurred. The goal in this workflow would be to avoid tagging the large source notes with the tag and hurting the focus of the embedded query. Instead you would quickly flesh out these comp notes and they would embed and also direct you to the source without complicating vault. You could nested tag the Concept/element and then hunt down the locations that occurs, silo them into headings within their source notes and embed the heading in that specific flavor (element) based concept comp notes which would get the tag (that the query searched).
It is besides the point, but you could even quickly do this for several other concepts and sub elements with the plan of embedding the query notes within a composite note itself.
It may feel kind of hacky and go against the best practice of permanent vault organization, but these are not for that purpose. These are for building something new out of pieces of the pieces that already are organized within your vault, and doing it quickly before the flow and energy has passed.
It would be particularly cool if you could link to these query results from within note, so as to again avoid complicating your vault and graph. With that linking, you could to add some commentary at the top of your composite notes about some of the query results transcluded below while actually pointing to them. For example, you could write commentary relating a couple of the query results you know would be shown below in preview mode and actually link to them in note as if they were headings within the query block.
Sorry for the length. I will edit down for clarity and probably eventually create a focused feature request for this ability I mentioned at the end, but I wanted to at least demonstrate a strong interest in this feature with specific possible workflows that it would make possible among the much more obvious ones.
Thanks.