There are NES emulators aplenty, the only value in writing a new one is pedagogic, for the writer.

This endeavor had negative net value.

Do you think that the use of a hammer is an innate skill, and that woodworkers learn nothing from their craft?

You ask what you learned building the house. The hammer hits the nails.

If it's a zillion dollar hammerbot the company is offering to your boss for pennies, that had better be your first priority!

Ask not what your hammer can do for you.

Do you like to read posts about what hammer can do? Especially when it has been done 100 times already.