5% of the work is getting it working. 95% is to make it polished and work well on all platforms, in all countries, in all legal and social contexts, and in all

5% of the work is getting it working. 95% is to make it polished and work well on all platforms, in all countries, in all legal and social contexts, and in all failure contexts. Most developers have zero clue what it takes to turn working code into a globally successful product.