Deprecate Schemaless Mode (Discussion)

I know this won't be the most popular ticket out there, but I am growing more and more sympathetic to the idea that we should rip many of the freedoms out that cause users more harm than not. One of the freedoms I saw time and time again to cause issues was schemaless mode. It doesn't work as named or documented, so I think it should be deprecated. 

If you use it in production reliably and in a way that cannot be accomplished another way, I am happy to hear from more knowledgeable folks as to why deprecation is a bad idea.