I'll second that. I have a 5800x and 3070 Ti in mine, runs great. CPU is cooled with an Arctic LF 2 280 AIO, which I wouldn't recommend to a stranger as it's pretty tight and probably not great for the tubes, but the point being that you can fit some fairly beefy gear. Don't think I would would gain much performance with a larger case as with all the ventilation everything is drawing fresh air.
Same here. The NR200 has hosted my gaming rig for over a year now with a 5800x3D and a 3090. Airflow is reversed to pull air in the back and bottom and blow it out the top, with some thin noctua fans on the bottom intake to get a little extra airflow to the GPU. It's a super capable and portable build. My brother did a near identical build with a 3070.
Also it fits in this nice sewing machine bag. I've brought it to friends houses to introduce them to VR and it perfectly holds an NR200, some power cables, a controller and my keyboard.
https://a.co/d/anJj9sM