AAA companies aren’t making these remasters, they are typically handled by small studios that specialize in exactly this kind of work.
Most of the work of re-releasing these old games is porting the old code to new platforms. Making them run at higher resolutions and frame rates is usually not all that much effort in comparison, so you might as well do it.
Frankly it’s kind of weird to complain about the existence of a product nobody is forcing you to buy.