I can't remember the last time a schema I made in week 1 was similar to the schema in week 4. That alone is why I made that statement. Modifying schemes requires modifying code all over the place that relies on it. The majority of the time, with Mongo, I can ignore those changes and only code for what I added.

That is my experience. Perhaps you have the patience and foresight to plan out your schema well before coding.