I agree. Black and white often pop up against certain types of content (e.g. white spreadsheets on black background, dark mode terminals on white), but gray's a good compromise.
I worked at Best Buy circa 2005 and we had a single Mac Mini on the floor that had the fish wallpaper and it always drew me in. I had no interest in Macs at the time, but there was something alluring behind that wallpaper.
https://wallpapertag.com/img/eyJpdiI6ImlFY2hqYStNSno4Z0dBcGY...
https://wallpapertag.com/img/eyJpdiI6IlZ2N1R4bVpXYm9DVTRPS3l...