I've seen people genuinely wonder how one would go about making a 2D platformer without a generalized third-party physics engine—as though every single classic 2D platformer didn't have its own simple, bespoke physics simulation!

There are entire classes (even genres) of video games that don't require substantial third-party library support, and it's frustrating to see that this seems to be more and more of a minority view as time goes on.