Interestingly, Deno and Node were both originally developed by the same person, Ryan Dahl.

Why did he feel the need to build a competitor to his own product? Whatever features are supposed to make Deno "better" than Node...why didn't he just work on integrating them into Node?

I understand that sometimes changes to software can be infeasible, especially if they are large fundamental/foundational changes, but this is still a bit of a head scratcher to me.