Also resolution stopped at 1080p for a decade. Now that 4k is happening, there is an easy path to performance for gpu manufacturers.
High-end for 4:3 was 2048x1536 (3 megapixels)
High-end for 16:10 was 1920x1200 (2.2 megapixels)
High-end for 16:9 was until very recently 1920x1080 (2 megapixels)