There are changes in how the hardware work overtime, its primary graphic system the changes on PC in a way that are not always backward compatible
In the same way, there is changes in the operating system over time and once again what has changed most is the advanced graphics features that game uses.
PC hardware and Microsoft windows are quite good in regards to backward compatibility, It is primary for property software used by companies and usually does not use advanced graphics features.
The ability to run on older hardware and OS for games can be done because how they work is a known quantity so you can add code if required to handle differences. The backward compatibly will be to the hardware and OS that play the game at a reasonable performance or limit to what potential customers out there use and to what degree the extra works worth increase in sales.
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