BSON 16MB limit is not that limiting

The maximum BSON document size is 16 megabytes.  — Source: MongoDB Docs

Here are the approximate English version word counts of some popular novels:

Harry Potter
The Philosopher(Sorcerer)’s Stone – 76,944 words @ 429K
The Chamber of Secrets – 85,141 words @ 481K
The Prisoner of Azkaban – 107,253 words @ 597K
The Goblet of Fire – 190,637 words @ 1100K
The Order of the Phoenix – 257,045 words @ 1500K
The Half-Blood Prince – 168,923 words @ 969K
The Deathly Hallows – 198,227 words @ 1200K
TOTAL RAW Text Size = 6276 KB or 6.2 MB

Lord of the Rings
The Hobbit – 95,022 words @ 522K
Fellowship of the Ring – 177,227 words @ 1005K
Two Towers – 143,436 words @ 820K
Return of the King – 134,462 words @ 711K
TOTAL RAW Text Size = 3058 KB or 3 MB