It’s funny, because often they aren’t prettier. Well optimized and well made games from 5 or even 10 years ago often look on par better than the majority of AAA slop pushed out now (obviously with exceptions of some really good looking games like space marine and some others) and the disk size is still 10x what it was. They are just unrefined and unoptimized and try to use computationally expensive filters, lighting, sharpening, and antialiasing to make up for the mediocre quality.