ATD is very good - at it's original resolution.If you ran the Mac Studio with the Thunderbolt Display as your primary monitor, do you think it would be awful? I know the resolution is half but I'm coming from a 22" 1080 screen and was considering a Thunderbolt Display...
For text, HTML and web use - it's perfect which is what I use it for.
ASD is my video streaming / hi res video playback screen.
And the antiglare feature of the ASD is superior to the ATD.....