A number of possible answers here. There are still very small games. However in most cases people expect a lot more from a game/PC. Years ago a PC would boot into an OS that would then load a single game. The system would be doing one thing at a time, all the resources of the machine would be dedicated to doing that one thing. Switching between tasks could take minutes. In most cases today the systems are doing multiple things at the same time. You can alt tab from a game that is doing on the fly video mapping to a web browser and back for example.
The original doom was a 2d map with pseudo 3d and sprite based graphics. Compare with the current doom games that render the 3d environment real time with entirely dynamic lighting.
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