This is big. Only concerning part seems to be the large antenna required on the satellites, which would probably incur some extra scrutiny by regulators, but IMO the benefits of something like this far exceed the downsides.
There's a good chance this might mean these are limited to the ~350 KM shells, which will deorbit faster (limiting debris risk), and will go into sunset sooner.
Astronomy issues: https://en.wikipedia.org/wiki/Satellite_flare#Mega-constella...
Orbital debris: https://en.wikipedia.org/wiki/Kessler_syndrome#Potential_tri...
Nobody bothered to look at the details.
This is a solid contender for humanity's epitaph.
The concerns are difficult to dispute because they’re “not even wrong”. There are no specific claims that can be disputed.
Serious astronomers don’t just look at a photo with bright dots and get confused because some of them are satellites. A few predictable bright pixels are the least of their concerns.
As far as space debris, see https://en.m.wikipedia.org/wiki/List_of_space_debris_produci...