I guess with this article Timelapse photography and darktable I am kind of the orignator of that issue 
I also realized the blob should be untouched.
I once also got the idea, a little helper program could read the editabl/edited values and write a new blob., maybe the crawler could even initiate it, once he finds, the editable values are different from the blob
If I could code and would have the time, I would have started it already.
Would it make sense to update my FR #4250 accordingly or make a new one?