Then you realize doing some action ends up being O(n^2) so you add some workaround in your switch and cache some things. And you know what they say about cache invalidation. And vendor A implemented it wrong in 1993 so you have a special case for their systems. And then you want to handle abuse cases. And authentication. And you're competing against the whole rest of the world and your thing isn't enough better.
Then you realize doing some action ends up being O(n^2) so you add some workaround in your switch and cache some things. And you know what they say about cache invalidation. And vendor A implemented it wrong in 1993 so you have a special case for their systems. And then you want to handle abuse cases. And authentication. And you're competing against the whole rest of the world and your thing isn't enough better.