This has been going on for much longer than Starlink.

There were a number of observatories built in or near cities. They became mostly useless once we figured out electric lights but we still use them for education sometimes.

SpaceX has been working with the NSF so they can continue to dim Starlink https://spacenews.com/nsf-and-spacex-reach-agreement-to-reduce-starlink-effects-on-astronomy/

Now we’re putting more and more observation capabilities deep into space. JWT is already getting images better than anything you could get on earth, even if you eliminated Starlink and turned off every light on the planet. Ground based astronomical observation is still relevant but we keep coming up with better alternatives.