Not sure if this has been posted already but it is an interesting read and attempts to analyse and quantify the detrimental effects predicted on astronomical observations by massive super constellations of internet satellites that are coming to a sky near all of us.
Impact of satellite constellations on astronomical observations with ESO telescopes in the visible and infrared domains
Seems to suggest that while overall the affect of many 10's of 1000's of low earth orbit satellites, on most narrow field astronomical observations, using current commonly used methods and instruments, will be minimal to moderate, wide field and survey astronomy however will likely be more seriously affected.
The paper is a year old now, so perhaps things have been further analysed but I couldn't help feeling that it had an air of almost wishful thinking, "it isn't as bad as we might think" at least based on current detection methods and typical fields of view used in astronomy at the moment?
To me, having around 2hrs of full darkness, every clear night, infiltrated, to any obvious degree, by a problematic man-made effect and on a formerly pristine environment, is not something to disregard as meah, business as usual and just a sign of progress. Without some effective careful guidelines around the development of such massive networks, it doesn't seem too alarmist, to be very worried that it could easily get way out of hand in the future....
Mike