Even when I was playing on a 32in QHD 1440p monitor with ultra textures, I was never really able to fly without having zoomed views mapped to my controller or keyboard.
Bigger resolution/size will help, but I’m not convinced it will completely solve the issue.
Now I’m playing on a 34in WQHD monitor and things are actually a bit “smaller” now due to the aspect ratio.
Now, all that said, 21in does seem on the small side 